AIR DUCT BLOCKING DEVICE FOR OBSTRUCTING AIRFLOW THROUGH PORTIONS OF AN AIR DUCT SYSTEM
The present invention discloses an air duct blocking device for obstructing airflow through portions of an air duct system. The blocking device may include a support plate having an interior side and an exterior side and an adjustable fastener configured on the exterior side. The air duct blocking device may include a flexible connector having a hook at one end that is capable of attaching to a register boot. The flexible connector passes through the support plate and the adjustable fastener, and the adjustable fastener is capable of securing the support plate in a fixed position relative to the flexible connector. The air duct blocking device may include a substantially planar gasket configured on the interior side of the support plate that is capable of blocking airflow through the register boot when the gasket is held against the register boot by the adjustable fastener secured to the flexible connector.
This application claims the benefit of and is a continuation-in-part of Non-Provisional Application No. 12/757,397 entitled“Air Vent Cover For Use In Testing Air Leakage Of An Air Duct System” and filed on Apr. 9, 2010, which is incorporated herein by reference in its entirety.
This application claims the benefit of Provisional Application No. 61/447,014 entitled “Installation And Removal Tool For Use With An Air Vent Cover For Sealing An Air Vent” and filed on Feb. 26, 2011, which is incorporated herein by reference in its entirety.
TECHNICAL FIELDThe present invention relates to the field of air duct blocking devices for obstructing airflow through portions of an air duct system.
BACKGROUND ARTAs the trend to conserve energy continues, more individuals are demanding and more governmental entities are mandating that houses and commercial facilities undergo periodic energy audits. An energy audit is a service where a building structure's energy efficiency is evaluated by a person using professional equipment as blower door and infra-red cameras), with the aim to suggest the best ways to improve energy efficiency in heating and cooling the structure.
An energy audit involves recording various characteristics of the building envelope including the walls, ceilings, floors, doors, windows, and skylights. For each of these components the area and resistance to heat flow (R-value) is measured or estimated. The leakage rate or infiltration of air through the building envelope is of concern and is strongly affected by window construction and quality of door seals such as weather stripping. The goal of an audit is to quantify the buildings overall thermal performance. The audit may also assess the efficiency, physical condition, and programming of mechanical systems such as the heating, ventilation, air conditioning (HVAC) equipment, and thermostat.
Leaks in an air duct system often account for a large percentage of energy being wasted in a typical home. In a residence, the percentage of air that escapes out of an air duct system due to leaks, on average, is approximately twenty-five percent (25%). Given that in some areas of the country, sixty percent (60%) to seventy percent (70%) of the cost of a households monthly utilities bill is due to the operation of the HVAC system, air leakage in an air duct system may represent a significant waste of both monetary and energy resources.
Measuring the leakage in an air duct system is generally the most time consuming portion of a home energy audit. In fact, as much as fifty percent (50%) of the time required to perform a home energy audit is consumed in testing air leakage of an air duct system. The majority of that time is spent sealing off the various air vents so that the air duct system can be pressurized or depressurized to measure the air leaks.
Current methods of sealing off the air vents involve the use of a special adhesive tape that adheres to the face of an air vent. There are, however, certain drawbacks to the use of this adhesive tape. Applying and removing the adhesive tape to all of the air vents takes a significant amount of time because the adhesive tape is cumbersome and awkward to use. Commonly, the tape sticks to itself and those pieces have to be thrown away unused. The tape is generally stored in bulky spools that are heavy and difficult to maneuver. When the tape is removed from the spools, it can generate an extremely loud noise that may wake up members of a home that are asleep during the day, such as, for example a baby or elderly person taking a nap, or be disruptive to ongoing business concerns.
Another drawback is that the tape does not provide the best seal possible for the air duct system. Even after the tape is applied to the air vent, air may still enter and leave the air duct system beneath the face of the air vent that touches the wall or ceilings surface because the tape only blocks the openings of the air vent on the face of the air vent. The tape does not block openings between the air vent and surface on which the air vent is installed. An additional drawback occurs when the tape is removed. Because the tape uses a strong adhesive, damage often occurs to the wall, ceiling, or air vent when the tape is removed.
Many audits of a building's HVAC system occur while the building is still under construction. For example, prior to the sheet rock being installed in a building, technicians will test an HVAC system for leaks and energy efficiency to allow for easy repair or adjustments prior the installation of surfaces that may hinder such repair or adjustment efforts. During subsequent construction, however, debris, dust, and dirt have the potential to enter into an HVAC system through the air vent boots and other openings in an HVAC system. Currently, construction workers attempt to prevent such debris from entering the HVAC system by taping cardboard to the HVAC openings or stuffing material into the openings to block the debris from entering. None of the current solutions serve to provide an effective seal, however, to protect the HVAC system during the final stages of construction.
SUMMARY OF INVENTIONThe present invention discloses an air duct blocking device for obstructing airflow through portions of an air duct system. An air duct blocking device according to embodiments of the present invention may include a support plate having an interior side and an exterior side and an adjustable fastener configured on the exterior side of the support plate. Such an air duct blocking device according to embodiments of the present invention may include a flexible connector having a hook at one end. The hook is capable of attaching to a register boot in the air duct system, and the flexible connector passes through the support plate and the adjustable fastener. The adjustable fastener is capable of securing the support plate in a fixed position relative to the flexible connector. Such an air duct blocking device according to embodiments of the present invention may include a substantially planar gasket configured on the interior side of the support plate. The gasket is capable of blocking airflow through the register boot when the gasket is held adjacent to the register boot by the adjustable fastener being secured to the flexible connector.
Rather than utilizing a gasket, another air duct blocking device according to embodiments of the present invention may include a blocking plug configured on the interior side of the support plate. The blocking plug is capable of obstructing airflow through the register boot when the blocking plug is held against a collar inside the register boot by the adjustable fastener being secured to the flexible connector.
Still further, an air duct blocking device according to embodiments of the present invention may include a substantially planar cap having an adjustable fastener configured on an exterior side of the cap. The cap is capable of blocking airflow through a register boot of an air duct system when the cap is secured to the register boot. Such embodiments of an air duct blocking device may also include a flexible connector having a hook at one end. The hook is capable of attaching to the collar of the register boot in the air duct system. The flexible connector passes through the cap and the adjustable fastener, and the adjustable fastener is capable of securing the cap in a fixed position relative to the flexible connector.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an implementation of apparatus and methods consistent with the present invention and, together with the detailed description, serve to explain advantages and principles consistent with the invention. In the drawings,
Exemplary embodiments of air duct blocking devices for obstructing airflow through portions of an air duct system are described herein with reference to the accompanying drawings, beginning with
Though air duct systems vary from one installation to another, many air duct system share a common set of components. Air duct systems generally include an air handler unit that may be composed of a blower or fan, heating or cooling elements, filters, humidifier, mixing chamber, heat recovery device, controls, and vibration isolators. In addition, air duct systems typically include a network of plenums, ducts, and boots that direct airflow between the air handler unit and various air vents registers used to supply air to or return air from the spaces served by the air duct system. Readers will note that much of the air vent system is omitted from
In
In the example of
The air duct blocking device (100) of
In the example of
The exemplary the air duct blocking device (100) of
The flexible nature of the flexible connector (110) facilitates quick and easy attachment to and detachment from the register boot (114). A flexible connector provides certain advantages over a rigid connector, which is often used in long-term or permanently installed covers. Rigid connectors, such as those fashioned from a system of nuts and bolts, are cumbersome and more time-consuming to attach and detach because the air vent cover must be precisely placed in the proper orientation for a rigid connector to connect with the air vent. For example, when using a rigid connector made up of a bolt through the air vent cover, typically the air vent cover has to be lined up with the connection point on the air vent. After lining up the air vent cover, however, the air vent cover often blocks or covers the connection point for the rigid connector on the air vent, thereby enhancing the difficulty associated with making the connection between the rigid connector and the collar of the register boot. When using a flexible connector, however, there is no requirement that the air duct blocking device be aligned with the air vent register boot when attaching the connector the collar of the register boot because the flexible connector can bend or twist in the manner needed to quickly and easily connect to the air vent.
In fact, in the example of
The exemplary the air duct blocking device (100) of
A gasket is a mechanical seal that fills the space between two mating surfaces. Gaskets allow “less-than-perfect” mating surfaces to seal by filling in irregularities of the mating surfaces. For example, use of the gasket (116) helps create a seal around the edges of the register boot (114) because the gasket (116) engulfs portions of the register boot (114) when the gasket (116) is pressed against the register boot (114). Also, for uses when the air duct blocking device (100) is used to a seal a register boot with the air vent register installed, the gasket of may help the air duct blocking device seal against rough surface such as an interior ceiling or wall with a popcorn texture or other rough texture or even the louvers of the register itself. In this manner, a gasket blocks the flow of air between the inside and outside of the register boot while under compression. The gasket may be formed from a variety of materials as will occur to those of skill in the art, including, for example, foam, rubber, nylon, or plastic. When formed from material such as foam, readers will note that there are two types of foam that could be used to create a gasket according to embodiments of the present invention-open-cell foam and closed-cell foam.
In open-cell foam, the cell walls, or surfaces of the bubbles, are broken and air fills all of the spaces in the material. In this manner, open-cell foam creates a permeable barrier that may allow air to flow through it when uncompressed. When compressed, however, the open-cell foam may provide enough of a barrier to serve as a seal. The open-cell nature makes the foam soft or weak, as if it were made of broken balloons or soft toy rubber balls. The insulation value of this foam is related to the insulation value of the calm air inside the matrix of broken cells.
In closed-cell foam, most of the cells or bubbles in the foam are not broken; they resemble inflated balloons or soccer balls, piled together in a compact configuration. This makes the closed-cell foam strong or rigid because the bubbles are strong enough to withstand high-pressure. Although closed-cell foam is rigid, it has varying degrees of hardness, depending on its density. Because the cell walls of closed-cell foam are not generally broken, closed-cell foam provides greater resistance to air leakage than that of open-celled foam.
In the example of
For further illustration,
The air duct blocking device (100) of
The air duct blocking device (100) of
In the example of
The air vent register (120) of
In
Turning to
The register boots depicted in
Turning to
The exemplary air duct blocking device (300) of
The exemplary air duct blocking device (300) of
Turning to
Similar to the other exemplary air duct blocking devices, the air duct blocking device (200) of
While the other exemplary air duct blocking devices described utilized a gasket, the air duct blocking device (200) of
While certain exemplary embodiments have been described in details and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative of and not devised without departing from the basic scope thereof, which is determined by the claims that follow.
Claims
1. An air duct blocking device for obstructing airflow through portions of an air duct system, the air duct blocking device comprising:
- a support plate having an interior side and an exterior side;
- an adjustable fastener configured on the exterior side of the support plate;
- a flexible connector having a hook at one end, the hook capable of attaching to a register boot in the air duct system, the flexible connector passing through the support plate and the adjustable fastener, the adjustable fastener capable of securing the support plate in a fixed position relative to the flexible connector; and
- a substantially planar gasket configured on the interior side of the support plate, the gasket capable of blocking airflow through the register boot when the gasket is held adjacent to the register boot by the adjustable fastener being secured to the flexible connector.
2. The air duct blocking device of claim 1 wherein the gasket is configured to engulf portions of the register boot pressed against the gasket.
3. The air duct blocking device of claim 1 wherein:
- the air duct system comprises an air vent register attached to the register boot; and
- the gasket is capable of blocking airflow through the register boot when the gasket is held against the air vent register by the adjustable fastener being secured to the flexible connector.
4. The air duct blocking device of claim 3 wherein the gasket is configured to engulf portions of the air vent register that protrude into the gasket.
5. The air duct blocking device of claim 1 wherein the hook of the flexible connector attaches to a collar of the register boot.
6. The air duct blocking device of claim 1 wherein the adjustable fastener comprise a pushbutton configured to allow the flexible connector to pass freely through the adjustable fastener when the pushbutton is depressed and to hold the flexible connector in a fix position relative to the adjustable fastener when the pushbutton is released.
7. The air duct blocking device of claim 1 wherein the gasket comprises an outer edge region that is tapered away from the support plate.
8. The air duct blocking device of claim 1 wherein the flexible connector comprises an outer surface that is textured to increase friction between flexible connector and the adjustable fastener.
9. The air duct blocking device of claim 1 wherein the flexible connector and the adjustable fastener are configured to operate together as a ratchet.
10. The air duct blocking device of claim 1 wherein the perimeter of the gasket is larger than the perimeter of the support plate.
11. The air duct blocking device of claim 1 wherein the flexible connector is configured to be rigid in a first orientation and bendable along a second orientation.
12. The air duct blocking device of claim 1 wherein the support plate along a first dimension is at least as large as an opening along a corresponding dimension of the register boot.
13. An air duct blocking device for obstructing airflow through portions of an air duct system, the air duct blocking device comprising:
- a support plate having an interior side and an exterior side;
- an adjustable fastener configured on the exterior side of the support plate;
- a flexible connector having a hook at one end, the hook capable of attaching to a register boot, the flexible connector passing through the support plate and the adjustable fastener, the adjustable fastener capable of securing the support plate in a fixed position relative to the flexible connector; and
- a blocking plug configured on the interior side of the support plate, the blocking plug capable of obstructing airflow through the register boot when the blocking plug is held against a collar of the register boot by the adjustable fastener being secured to the flexible connector.
14. The air duct blocking device of claim 13 wherein the flexible connector comprises an elastic cord.
15. The air duct blocking device of claim 13 wherein the flexible connector comprises a hook for attaching the flexible connector to a collar of the register boot.
16. The air duct blocking device of claim 13 wherein the flexible connector is configured to be rigid in a first orientation and bendable along a second orientation.
17. An air duct blocking device for obstructing airflow through portions of an air duct system, the air duct blocking device comprising:
- a substantially planar cap, the cap having an adjustable fastener configured on an exterior side of the cap, the cap capable of blocking airflow through a register boot of an air duct system when the cap is secured to the register boot; and
- a flexible connector having a hook at one end, the hook capable of attaching to the collar of the register boot in the air duct system, the flexible connector passing through the cap and the adjustable fastener, the adjustable fastener capable of securing the cap in a fixed position relative to the flexible connector.
18. The air duct blocking device of claim 17 wherein the cap is configured from spongy material.
19. The air duct blocking device of claim 17 wherein the cap is foam.
Type: Application
Filed: May 16, 2011
Publication Date: Oct 13, 2011
Inventor: Richard Corey Breed (Austin, TX)
Application Number: 13/108,957
International Classification: F24F 13/20 (20060101);