Abstract: A method for cleaning up oil spills using multi-layered carbon fiber-based absorbents is disclosed. The method for cleaning up oil spills requires an oil-contaminated area including a quantity of oil, a first storage vessel, an oil extraction machine, a heating element, and a multi-layered carbon fiber absorbent. The multi-layered modified carbon fiber absorbent is distributed to the oil-contaminated area, where the multi-layered modified carbon fiber absorbent is configured to extract the quantity of oil from the oil-contaminated area while maintaining hydrophobic. The quantity of oil is extracted and separated from the multi-layered modified carbon fiber absorbent using the oil extraction machine. The extracted quantity of oil is collected into the first storage vessel. The extract quantity of oil is then transferred over to a second storage vessel for later refinement.

Abstract: A downspout guard having opposed sidewalls and opposed end walls connected to a top wall, all formed from material having openings therethrough, such as perforated metal. Bottom edges of the walls engage a gutter bottom wall to hold the guard in place and forcing water to flow through the guard before entering the downspout. The sidewalls can engage gutter front/back walls, further holding the guard in place. Trapped debris enhances further debris entrapment, even trapping particles smaller than the material openings.

Abstract: Disclosed herein are gutter guard systems arranged to efficiently manage the flow of rainwater across the system and prevent the matting of debris onto the system. In one exemplary embodiment, a gutter guard system includes a main body and a screen covering the main body. The main body includes a front receiver, a rear receiver, and a water management section positioned between and connecting the front and rear receivers. The screen spans the water management section and is secured to the main body by engagement on one end with the front receiver and on the opposite end with the rear receivers. When the gutter guard system is installed in a rain gutter, the front receiver engages with the front edge of the rain gutter, and the rear receiver engages with the rear portion of the rain gutter.

Abstract: A gutter debris preclusion device for use with a gutter attached to a building, comprising a support structure being substantially rigid and having a recess with a plurality of apertures and a plurality of ribs; a screen having a plurality of apertures and being at least partially disposed on the ribs of the support structure; and, wherein a cross-sectional profile of the screen has an arc shape.

Abstract: A modular platform for configuring gutter guard systems is disclosed and claimed herein. The modular platform includes a number of interchangeable components that can be assembled to form a gutter guard system for use with specific rain gutters based on a rain gutter's style, size, color, and attachment mechanism used to secure the rain gutter to a structure and/or roofline. One such interchangeable component is a main body with securing features. The securing features of the main body can be positioned and arranged such that when two main bodies are appropriately positioned, the securing features engage in a manner that secures the two main bodies together into a continuous main body assembly. The securing features can be, tabs and slots that cooperate to form a friction fit or a series of hooks and aperture edges to capture the hooks to secure the two main bodies together.

Abstract: A gutter cover, components thereof, and associated methods. The gutter cover is configured to be installed over a gutter to prevent debris from entering the gutter. The gutter cover can be made of a webbing material having openings through which water can pass. The gutter cover includes features that facilitate water penetration through the gutter cover for the water to enter the gutter. For example, the webbing material is formed to define a diverter protruding upward and extending lengthwise along the gutter cover body. The diverter has a peak, a rear leg extending upward and forward toward the peak, and a forward leg extending downward and forward from the peak. The rear leg is steeper and shorter than the front leg such that the rear leg defines a water impact surface configured to break surface tension of water flowing along the top of the gutter cover.

Abstract: A modular platform for configuring gutter guard systems is disclosed and claimed herein. Such gutter guard systems are designed and arranged to be positioned across the opening of a rain gutter to prevent debris from entering the rain gutter. The modular platform includes a number of interchangeable components. Select interchangeable components can be assembled to form a gutter guard system for use with a specific rain gutter based on the rain gutter's style, size, color and the mechanism used to secure the rain gutter to a structure and/or roofline. In one embodiment, the components of a modular platform for configuring gutter guard systems include a number of main bodies, a front receiver, a number of rear receivers, a number of screens, and a clip.

Abstract: A modular platform for configuring gutter guard systems is disclosed and claimed herein. Such gutter guard systems are designed and arranged to be positioned across the opening of a rain gutter to prevent debris from entering the rain gutter. The modular platform includes a number of interchangeable components. Select interchangeable components can be assembled to form a gutter guard system for use with a specific rain gutter based on the rain gutter's style, size, color and the mechanism used to secure the rain gutter to a structure and/or roofline. In one embodiment, the components of a modular platform for configuring gutter guard systems include a number of main bodies, a front receiver, a number of rear receivers, a number of screens, and a clip.

Abstract: A modular platform for configuring gutter guard systems is disclosed and claimed herein. Such gutter guard systems are designed and arranged to be positioned across the opening of a rain gutter to prevent debris from entering the rain gutter. The modular platform includes a number of interchangeable components. Select interchangeable components can be assembled to form a gutter guard system for use with a specific rain gutter based on the rain gutter's style, size, color and the mechanism used to secure the rain gutter to a structure and/or roofline. In one embodiment, the components of a modular platform for configuring gutter guard systems include a number of main bodies, a front receiver, a number of rear receivers, a number of screens, and a clip.

Abstract: Disclosed and described herein are components for configuring and assembling gutter guard systems for trough-style and built-in gutter systems. Such gutter guard systems are designed and arranged to be positioned across the opening of a trough or box gutter to prevent debris from entering the rain gutter. The modular assembly includes a number of configurable components. In one embodiment, a gutter guard system includes a customizable main body, a mesh screen, a front receiver, and a rear receiver. The customizable main body includes a top surface, a bottom surface, a front edge, and a rear edge, and the main body is arranged to be trimmed to custom dimensions. Once assembled, the mesh screen is positioned on the top surface of the main body, the front receiver is positioned along the front edge of the main body, and the rear receiver is positioned along the rear edge of the main body.

Abstract: A gutter cover for covering an open top of a gutter, comprising: a central cover portion positionable over the open top; a rear cover mounting portion extending rearwardly from a rear central cover portion end and being engageable with a rear gutter portion of the gutter; and a front cover mounting portion extending forwardly from a front central cover portion end and being engageable with the front gutter portion, the front cover mounting portion being configured such that a distal front mounting portion end of the front cover mounting portion is located under the central cover portion and rearward of the front central cover portion end and such that a reinforcement portion of the front cover mounting portion adjacent the distal front mounting portion end is superposed against a bottom central portion surface of the central cover portion, the reinforcement portion being secured to the central cover portion.

Abstract: A modular platform for configuring gutter guard systems is disclosed and claimed herein. Such gutter guard systems are designed and arranged to be positioned across the opening of a rain gutter to prevent debris from entering the rain gutter. The modular platform includes a number of interchangeable components. Select interchangeable components can be assembled to form a gutter guard system for use with a specific rain gutter based on the rain gutter's style, size, color and the mechanism used to secure the rain gutter to a structure and/or roofline. In one embodiment, the components of a modular platform for configuring gutter guard systems include a number of main bodies, a front receiver, a number of rear receivers, a number of screens, and a clip.

Abstract: A filtration device for filtering a fluid includes a first barrier member having a plurality of openings through which the fluid can penetrate the first barrier member, the first barrier member having a plurality of edges including a first edge; and a first ion-dispersing thread in the first barrier member. A portion of the first ion-dispersing thread extends in a direction, the direction is non-parallel to the first edge of the first barrier member, and the direction is non-perpendicular to the first edge of the first barrier member.

Abstract: A roof gutter for the purpose of keeping small debris out of the gutter and allowing rainwater to pass into the gutter. The covering is comprised of a water permeable, weather resistant mesh having apertures of a pre-determined size for passing water, the mesh sized to substantially cover a rain gutter; corrugations formed in the mesh, a debris collection first trough disposed along a longitudinal axis of the mesh, formed by making at least two bends in the mesh, the first trough located between a longitudinal midline of the mesh and a front gutter end of the mesh.

Abstract: A gutter cover includes an upper hood panel, a lower cover panel, and a retractable plate. The upper hood panel is configured to be joined to an inclined roof sheathing covering rafters of a roof, to extend above a gutter and to no more than partially shield the gutter from above. The lower cover panel is configured to cover the gutter, such that a gap is present between the upper hood plate and the lower cover panel. The retractable plate is located above the lower cover plate, and configured to be movable between a retracted configuration at least partially within the gap and an extended configuration at least partially located outside the gap. The retractable plate comprises a rear portion and forward flap, the forward flap sloping upward from a forward edge of the rear portion. The lower cover panel has first openings. The retractable plate has second openings.

Abstract: A raised gutter cover that is live loaded and acts as a compressions spring when mounted on a gutter hung with high-hangers and securely attaches the gutter cover to the gutter and the building allowing water shed from the pitched roof to separate from any debris and strain through the gutter.

Abstract: A self-supporting gutter guard device is described having a bridge member composed of a decking material having a plurality of orifices, and having a roof side and an opposing gutter lip side, at least one groove disposed in the decking material altering a profile of the deck material to outline a 3-dimensional geometry that spans the bridge member from a proximal end of the bridge member's roof side to a proximal end of the bridge member's gutter lip side, a roof attachment member configured to attach to the roof side of the bridge member, and a gutter attachment member configured to attach to the gutter lip side of the bridge member, wherein the 3-dimensional geometry of the at least one groove enables the device to be self-supporting.

Abstract: A gutter cover, components thereof, and associated methods. The gutter cover is configured to be installed over a gutter to prevent debris from entering the gutter. The gutter cover can be made of a webbing material having openings through which water can pass. The gutter cover includes features that facilitate water penetration through the gutter cover for the water to enter the gutter.

Abstract: In one embodiment of a bracket for use with a gutter guard system, the bracket includes a first wall; a second wall arranged generally parallel and spaced apart from the first wall; a slot at least partially defined by the first wall and the second wall; and a third wall. The third wall includes a first portion extending from a first end of the second wall at an angle relative to the second wall; a second portion extending at an angle relative to the first portion; and a third portion extending at an angle relative to the second portion. A fourth wall connecting a first end of the first wall and the second wall can further define the slot. The slot is arranged to removably secure the bracket to a rear receiver of the gutter guard system.

Abstract: A clip for use with a gutter guard system is disclosed and claimed herein. In one embodiment, a clip includes a first wall, a second wall arranged generally parallel and spaced apart from the first wall, a first slot defined by the first wall and the second wall, a third wall, a fourth wall spaced apart from the third wall, and a second slot defined by the third wall and the fourth wall. The first slot is arranged to removably secure the clip to a rear receiver of a gutter guard system, and the second slot is arranged to removably secure the clip to a gutter.

Abstract: A gutter cover for covering an open top of a gutter having front, rear and bottom walls defining a gutter channel, the gutter cover comprising: front and rear mounting portions operatively engageable with the front and rear walls of the gutter; a central cover portion extending between the front and rear mounting portions and having a plurality of drainage throughholes defined therein, the central cover portion including at least one fold extending in a lengthwise direction of the gutter cover along a longitudinal fold axis and a plurality of fold openings spaced apart from each other and located along the at least one fold to increase flexibility of the central cover portion along the at least one fold to facilitate bending of the central cover portion along the at least one fold, the fold openings being elongated in shape and extending longitudinally along the longitudinal fold axis.

Abstract: Provided is a seamless composite roofing system for a gravel built up surface. The system includes a first fluid application flood coat of bentonite emulsion applied over a gravel built up surface at a rate of 15 gallons per 100 square feet and a second fluid application flood coat of bentonite emulsion applied at a rate of 10 gallons per 100 square feet. The second flood coat includes approximately 3 to 6 pounds of chopped reinforced fiberglass per 100 square feet, and is applied over the first flood coat after the first flood coat cures. A fiberglass reinforcement layer with approximately 3 to 6 pounds chopped reinforced fiberglass per 100 square feet is applied over an area surrounding any roof top penetrations, followed by an elastic trowel grade mastic layer. An asphalt primer is then applied over the second flood coat, followed by a reflective Energy Star Rated top coat.

Abstract: The invention relates to a rain gutter assembly including a gutter (10) and a moving arrangement (16). The moving arrangement (16) is configured to move at least part of the gutter (10) between an operative or rain gathering position and an inverted or discharge position.

Abstract: Corrugated fine mesh material is configured to be located overlying a gutter. The fine mesh material has an upper edge opposite a lower edge with the upper edge configured to fit beneath shingles on a roof adjacent the gutter. The lower edge is configured to be held to a lip at a forward edge of the gutter. The corrugations add strength to the material and collect water at troughs thereof where the collected water more readily forms droplets that fall down into the gutter. A lower strip is preferably provided to hold the lower edge of the mesh to a lip of the gutter. An upper strip is optionally provided which includes a tab, which can fit beneath shingles to the roof. A barrier such as a bead of caulk can optionally be coupled to an underside of the corrugated mesh to further encourage water droplets to fall.

Abstract: A gutter cover for a rain gutter includes a U-shaped rear portion, a forward edge portion, and a perforated horizontal central portion spanning between the rear and forward edge portions. The forward edge portion includes a web extending upwardly from the central portion, and a covering flange and downward hooked edge portion extending forwardly from the web. The hooked edge portion having an end positioned for engagement with the underside of a front lip of the gutter.

Abstract: A pest deterrent system is provided by an elongate flat flexible panel configured to be formed into a compressed bowed shape and installed in the compressed bowed shape onto a portion of a roof support and an underside of roof sheathing. The bowed shape of the installed panel frictionally secures the panel in place adjacent the roof support and the roof sheathing without the use of fasteners.

Abstract: A gutter cover, components thereof, and associated methods. The gutter cover is configured to be installed over a gutter to prevent debris from entering the gutter. The gutter cover can be made of a webbing material having openings through which water can pass. The gutter cover includes features that facilitate water penetration through the gutter cover for the water to enter the gutter.

Abstract: A rapidly deployable modular microgrid including a plurality of renewable and other energy generation technologies, energy storage technologies, energy distribution networks, and intelligent control systems capable of managing the flow of electrical energy between one or more locations of energy generation, storage, and consumption are disclosed. The aforementioned microgrid may be delivered and rapidly deployed to provide primary or secondary electricity for a variety of purposes; including but not limited to household electrification, commercial or industrial productivity, grid resiliency, water pumping, telecommunication systems, medical facilities, and disaster relief efforts.

Abstract: The invention is a continuous gutter guard manufacturing process and a one-piece gutter guard article made therefrom which crimps a wire mesh filtration screen within the recesses of upper and lower supports of the one-piece gutter guard article. The wire mesh filtration screen has no underlying support, which is characteristic of a one-piece gutter guard construction. The upper and lower edges of the mesh filtration screen remain in a planar, non-embossed state, such that any ridges or patterns embossed into the screen do not follow into the portion of the screen that is crimped within the upper and lower supports of the gutter guard. This construction prevents the formation of debris pockets which can significantly reduce the performance of a one-piece gutter guard.

Abstract: Corrugated fine mesh material is configured to be located overlying a gutter. The fine mesh material has an upper edge opposite a lower edge with the upper edge configured to fit beneath shingles on a roof adjacent the gutter. The lower edge is configured to be held to a lip at a forward edge of the gutter. The corrugations add strength to the material and collect water at troughs thereof where the collected water more readily forms droplets that fall down into the gutter. A lower strip is preferably provided to hold the lower edge of the mesh to a lip of the gutter. An upper strip is optionally provided which includes a tab, which can fit beneath shingles to the roof. A barrier such as a bead of caulk can optionally be coupled to an underside of the corrugated mesh to further encourage water droplets to fall.

Abstract: A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit and at least one logic circuit. The at least one logic circuit is configured to receive, via the interface, a request and a reference clock signal. The at least one logic circuit is configured to transmit, via the interface, a digital value indicating a count in response to the request and the reference clock signal. The digital value varies based on the reference clock signal.

Abstract: A cover for a gutter is disclosed. The gutter may have a front section, a rear section, a gutter channel formed between the front section and the rear section, an intermediate flange portion extending from the front section, and an inner flange portion extending from the intermediate flange portion. The cover may include: a main body configured to cover the gutter channel when the cover is secured to the gutter; and a front flange may include: an upper flange portion that extends from the main body and is configured to interlock with the intermediate flange portion to secure the cover to the gutter; a connecting portion that extends from the upper flange portion; and a lower flange portion that extends from the connecting portion and has a free end extending towards the upper flange portion.

Abstract: A gutter protection and ladder support and safety apparatus includes a mechanism structured and arranged to be releaseably positioned in a gutter to prevent damage thereto caused by a ladder. The apparatus includes a mechanism for locking the apparatus in place to prevent lateral tipping and slippage of a ladder, a ladder supporting member operatively connected to the locking mechanism, and an adjustable ladder securing apparatus connected to the ladder supporting member and configured to releaseably secure a ladder thereto.

Abstract: A gutter debris barrier system is provided that includes a frame that is configured for direct attachment to a building and a filter screen for preventing debris from entering a gutter while allowing water to flow therethrough. The frame may include a floor with slots punched therein, with ribs on either side of the slots that form channels. The channels may be tapered to improve the speed and efficiency of heat transfer, and also to funnel water down into the gutter. The frame is made of a durable material, such as extruded aluminum. The frame has a first mounting flange that can bend and flex relative to the remaining portions of the frame, which allows for enough flexibility to enable the frame to be mounted directly to the building.

Abstract: Flashing for use at the edge of roofs or decks that are provided with surface materials are presented. In exemplary embodiments, flashing may be provided at the edge of a roof to retain or provide an edge treatment for an aesthetic and functional surface material, such as, for example, a cast paver, while at the same time allowing for water drainage. In one embodiment, a piece of flashing material contains a leg that is fastened along the edge of the top of a flat roof. This embodiment continues into two legs that form a V-shaped trough which comes off the roofing membrane and has penetrations at the bottom to release water. The outer leg of the “V” most commonly extends to a level higher than the roofing membrane in order to make contact with and edge an installed surface material. Various other shapes and end treatments, including various embodiments providing both an edge flashing as well as an integrated rectangular shaped gutter-like trough are also presented.

Abstract: A gutter cover for a rain gutter includes a U-shaped rear portion, a forward edge portion, and a perforated horizontal central portion spanning between the rear and forward edge portions. The forward edge portion includes a web extending upwardly from the central portion, and a covering flange and downward hooked edge portion extending forwardly from the web. The hooked edge portion having an end positioned for engagement with the underside of a front lip of the gutter.

Abstract: A side outlet device suitable for use in combination with a rainhead to form an overflow assembly is adapted to enable the rainhead to be mounted external to the building in relation to a wall of the building, to one side of a box guttering extending interiorly along the wall, whereby water flowing from the roof is able to pass through the side outlet device to a downpipe via the overflow device. The side outlet device has a respective end section at first and second opposite ends, with the first end section having a form corresponding to the form of a box gutter end section such that, with the side outlet device mounted in relation to the wall, the first end section extends through the wall and is receivable in the gutter receptor of the overflow device. The second end section is adapted for connection to the box guttering to enable water to flow from the box guttering and through the side outlet device to the overflow device.

Abstract: A soffit panel attachment device includes a central portion, an attachment surface, a plurality of flanges, and a plurality of openings extending through the central portion. The attachment surface extends perpendicularly from the central portion at a first end of the central portion. First and second flanges extend parallel to the central portion to form a U-shaped channel sized and shaped to receive a soffit covering material. Two soffit panel attachment devices may be installed in opposing configurations such that the U-shaped channels are positioned to support opposite ends of a soffit panel material. The plurality of openings may be a grid of hexagonal or circular openings that provide airflow paths across the soffit panel material such as from an exterior space into an attic space above the soffit.

Abstract: A roof gutter cap system includes a water channeling panel configured to contact an angled roof surface. The water channeling panel includes a plurality of apertures configured to channel water from the roof surface into a gutter attached to the roof. In one embodiment, the water channeling panel includes a flat base and a plurality of appendages protruding upwardly from the flat base. In another embodiment, the water channeling panel includes a corrugated section including a repeating alternating wall pattern.

Abstract: Various methods and systems are provided for a water collection feature of an imaging probe assembly. In one example, a medical imaging probe assembly includes an electrical connector, an imaging probe, and an electrical cable including a first end connected to the electrical connector and a second end coupled to the imaging probe, the cable including a water collection feature arranged at an outer surface of the cable, proximate to the first end. The water collection feature may have converging edges extending outward from the cable, toward the first end, shaped to draw water droplets away from the cable.

Abstract: A gutter cover system includes a gutter section forming an open channel, and a gutter cover section including a header and a plurality of bristles coupled to the header. The header of the gutter cover section has a longitudinal axis that is located along a first side wall of the gutter section. The plurality of bristles project outward from the header and span at least a portion of the open channel of the gutter section from the first side wall towards a second side wall of the gutter section.

Abstract: A method and system for aligning shingles on a roof using alignment marks placed directly on drip edges, limiting the need for stand-alone measurement devices.

Abstract: A gutter filtering device constructed to be mounted on top of a gutter opening and to extend from the front to the rear, and to attach to the front lip of the gutter. The gutter filtering device comprises a main body frame portion supporting a filtering media, a front mounting portion and a rear wing mounting portion. The main body frame portion is comprised of louvers that supports and holds a filtering media. The front mounting portion comprises a bending of the main body frame that folds over and crimps to the front end of the filtering media. The rear mounting portion comprises a separate rear wing folded over and crimpled to rear portion of the main body frame. The filtering media's top surface is shaped with many front to rear raised ridges in an repeating S-shape pattern that are parallel and form a consistent pattern from left to right.

Abstract: An adjustable gutter guard system includes a first water management component, a second water management component, and a screen. The first water management component includes a first main body section and a front receiver section. The second water management component is slideably arranged relative to the first water management component to adjust the width of the adjustable gutter guard system. The second water management component includes a second main body section and a rear receiver section. The screen is positioned in contact with the first main body section and the second main body section. Both the first main body section and the second main body section include a longitudinal body, a plurality of passageways through the longitudinal body, and at least one wall extending from a top surface of the longitudinal body.

Abstract: A front receiver for use as an interchangeable component with a modular platform for a gutter guard system is disclosed herein. One such front receiver is arranged for use with a gutter guard system that includes a main body, the front receiver includes a main section; an extension section extending at an angle from a front edge of the main section; a first leg; a second leg; and a drip edge. The main section includes the front edge, a rear edge, a top surface, and a bottom surface. The first leg extends generally perpendicularly away from the bottom surface of the main section. The second leg extends generally perpendicularly away from the first leg toward the rear edge of the main section. The drip edge extends perpendicularly from the second leg.

Abstract: An elongated rain gutter member is formed with a G-shape profile, and having an eave flange that fits between an edge of roofing material and the roof support beneath it, a generally vertical soffit portion extending down from the eave flange, and a curved rain channel member that curves outwardly and up forming a rainwater channel with the soffit portion, and continuing up and over the edge of the roofing material. A hemmed edge of the free edge portion of the curved rain channel member is fastened to the roofing material and is spaced so as to form channels into the rain gutter between the edge portion and the roofing material. This rain gutter can be used on a tin roof that has elongated ribs or can be adapted to use with a shingle roof or other roof.

Abstract: A gutter cover is engageable in a rain gutter channel to close a top opening of a rain gutter. The gutter cover includes a sheet of rigid and resilient material, the sheet having a pre-formed curved profile along a widthwise axis thereof, two opposing longitudinal edges, and a plurality of throughholes formed therein, the sheet being substantially flexible to modify its pre-formed curved profile for insertion into the rain gutter channel. A gutter assembly includes the gutter cover inserted in a gutter and in a method, the gutter cover engages with a gutter.

Abstract: A roof gutter cap system includes a water channeling panel configured to contact an angled roof surface. The water channeling panel includes a plurality of apertures configured to channel water from the roof surface into a gutter attached to the roof. The system further includes a gutter shield panel configured to span a distance between the gutter and the water channeling panel and prevent debris from entering the gutter. In one embodiment, the water channeling panel includes a flat base and a plurality of appendages protruding upwardly from the flat base. In another embodiment, the water channeling panel includes a corrugated section including a repeating alternating wall pattern.

Abstract: The gutter cover is placed on top of the gutter and protects the gutter from leaves and debris flowing into the gutter while allowing water to pass into the gutter. The material used to make the gutter cover is a loosely woven fiber mesh that is approximately ¼ inch in thickness with a width slightly larger than the opening of a gutter. The material allows water to pass easily but will not allow debris and leaves to pass. The material is placed on top of the gutter and deflects leaves and debris over the gutter. As stated above the material's width is slightly larger than the width of the gutter. The installer bends the material and places it on top of the gutter between the fascia board and the lip of the gutter. The material forms a convex surface over the top of the gutter.

Abstract: A low-profile screen which allows water to pass through apertures formed therein to allow water to drain through the screen. A plurality of ridges are formed on the surface of the screen to allow water to drain at a number of different elevations, to increase the structural rigidity of the screen, to improve snow-melting, and to improve the screens reliance when compressive forces are exerted on the screen. Under compression the screen snaps into place. The ridges further promote debris being blown off of the surface of the screen.