Abstract: A humidistat (17) generally includes a humidity sensing cartridge (20) adapted to be enclosed within a housing (18) having a base (21) and a front cover (22). The cartridge includes a plurality of engageable portions (24, 28). The housing base includes a peripheral frame (34) which surrounds and generally defines an enlarged rear opening (36) dimensioned to receive a humidity sensing cartridge therethrough. A plurality of flexible legs (38-40) extend forwardly from the base frame and have cams (41) and latches (42) adjacent their forward ends. A plurality of rigid posts (44, 45, 55) also extend forwardly from the base frame and include cams (52) terminating in openings (54) in the post walls. In assembly the cartridge to the base, the cartridge (20) is passed through the frame opening (36) from behind and rides onto the flexible leg cams (41) and snaps into place. Stops (50, 51) on at least some of the flexible legs and rigid posts limit the forward cartridge movement.

Abstract: An air filter assembly (1) includes an outer casing (6) having end, rear and downstream portions which are generally planular and thus easily settable on the floor during installation, with the downstream portion being mountable flush to a furnace (3) or the like. An inner filter-holding drawer (7) is provided for easy insertion and removal from the open front casing portion. At least one end wall (10, 11) of the casing is provided with a springable latch (34) adjacent the casing front opening and which snappingly engages and holds a cover (9)in place when the drawer is within the casing. The drawer end walls (44, 45) include external grooves (52) which slide over rails (56) correspondingly mounted internally of the casing side walls. The tolerances are such that the grooves are wider than the rails.

Abstract: In accordance with the various aspects of the invention, a spray booth media support module (1) includes a rectangular frame (5) which is of generally channel section. The frame forms opposing spaced end members (7) and connecting side members (8). One frame end has an inwardly bent lip (11) having spaced notches (13) therein. The opposed frame side members have slots (14). A generally rectangular grid (6) is adapted to be removably mounted to the frame. The grid includes spaced elements (15, 16) arrayed generally parallel to the frame end and side members. A plurality of wide prongs (17) extend outwardly from the grid for impaling an overspray-catching pad (4) thereon. At least several prongs are aligned in a vertical tier arrangement.

Abstract: A cutout (4) is made in a room wall (2) and flexible tubing (13) connected to a vacuum conduit (12) is pulled therethrough. A box (1) is attached to the tubing and includes a frame portion (15) for surrounding the cutout, and inwardly recessed portion (18) having side and top and bottom walls (19-22) and a back wall (23), and outwardly and inwardly extending annular connector flanges (25, 26) for connecting to the vacuum wand and the conduit flexible tubing. After the conduit tubing and box are connected, the box is pushed inwardly so that its recessed portion extends through the cutout into the wall. A slot (29, 30) is provided in each vertical sidewall of the box with the slot extending into the back wall so that it is generally L-shaped in section. A generally Z-shaped clip (33) having a long leg (35) and short leg (34) joined by a web (36) is provided for each slot.

Abstract: The invention provides a variable cycle moisturizing control circuit for a gas-liquid contact pad (8, 18) in humidifiers (1), precoolers (17) and the like, supplied with fluid from a solenoid valve (34). Temperature sensitive electric circuit means (FIG. 4) cyclically actuates the valve between ON and OFF states for intermittently moisturizing the pad with an intermittent flow of liquid, and includes means (26, 30) for variably changing the intermittent flow in response to temperature by changing the relative timing of the ON and OFF timed intervals such that the duration of one increases relative to the other. User accessible preadjustment means (38, 40) manually changes the length of one of the timing intervals, to preset the initial relative timing of the intervals according to pad size to afford a relatively longer ON time for larger pads, whereafter the other interval is automatically varied in response to increasing temperature.

Abstract: A solar heating control is adapted to be interconnected to a pre-existing auxiliary heating system connected to operate in response to a command signal issued by a pre-existing thermostat. The control operates in response to a first temperature sensed within the solar heating system to directly conduct the command signal from the thermostat to the auxiliary heating system to provide an auxiliary heating sequence. The control responds to a second sensed temperature at the solar heating system to respond to the command signal to operate the solar heating system. The control may be selectively deactivated to permit exclusive operation of the auxiliary heating system by the thermostat when desired. The control selectively connects an alternate impedance to the thermostat for operation in a solar heating sequence to provide similar cyclic operation in both the solar and auxiliary heating sequences.

Abstract: A water distributor is disposed above an air-liquid contact pad, and is supplied with water from a supply line. The water is received within an elongated enclosed chamber having at least one elongated corner in its lower portion. A floor portion of the chamber is formed of an imperferate slightly flexible wall disposed generally tangential to the corner. A screen is disposed on the inner surface of the floor portion and is manually adjusted to engage with the said corner in a line contact relationship to form a water flow restriction or gap. The chamber above the restriction is sealed. During each cycle of operation, as water initially flows into the chamber, a miniscus forms at the gap which prevents water discharge. As the chamber fills with water, the air thereabove is trapped and pressurized and, together with the pressure of the accumulating head of water, gradually increases the pressure on the miniscus.

Abstract: A device for conditioning air has a pad formed of a plurality of layers of slit and expanded media, with the pad having a plurality of groups of layers therewithin. Each layer within a particular group of layers has its baffles oriented to face in the same direction, while each group is turned around to face in the opposite direction from its directly adjacent group so that the baffles of one group face oppositely to the baffles of the next adjacent group. Alternate layers within each group are expanded to a slightly different degree so that the various elements making up each layer support the elements of adjacent layers in spaced unnested relationship. The dimensions of the expanded cells are substantially greater than those of known prior pads to better accommodate higher air velocities.

Abstract: A removable energy sensor for sensing the flow of electrical energy through a current carrying conductor. A magnetic flux conducting circuit includes a U-shaped bracket providing an opening for removably retaining a conductor while a removable pin is retained within openings at the outer portion of the bracket legs for securing a coil wound bobbin between such legs and for providing a coil surrounding such pin. The removable coil wound bobbin includes an insulator which cooperates with a similarly constructed insulator retained by the U-shaped bracket for sandwiching the electrical lead and maintaining such lead in spaced, isolated relationship with respect to the flux conducting circuit and the sensing coil.

Abstract: A damper assembly for solar heating systems and the like includes a damper blade pivotably mounted to a peripheral main frame. The damper blade is surrounded by a peripheral flexible sealing element which extends inwardly from the surrounding frame and which is inclined in a direction against the direction of closing damper blade movement. As the damper moves toward a closed position, its sides progressively engage the side portions of the sealing element, with the latter providing a seal with the peripheral face of the blade. The ends of the blade engage the sealing element prior to the blade finally reaching its ultimate closed position, with the sealing being complete at the moment of engagement and throughout the final range of blade movement. The peripheral sealing element is mounted to a subframe which is adjustable on the main frame to thereby sealingly accommodate a warped damper blade.

Abstract: A load indicator for an air cleaner associated with an air movement system which conducts air to a designated area in response to the supply of electrical energy from an energy source. An energy sensor includes a closed loop flux conducting circuit which is removably connected to surround at least one lead of the energy supplying circuit for generating a magnetic flux signal substantially proportional to the energy flow in the lead. The indicator operatively responds to a flux signal of a predetermined magnitude for providing a predetermined load indicating signal for the filter.

Abstract: An air filter is formed into an accordion-shaped body having reverse folds forming pockets. A plurality of string-like pleat spacing members are provided and with each member being threaded through a plurality of openings in the pocket walls. The openings are smaller in diameter than that of the spacing member when it is in a relaxed condition to provide a friction force fixedly holding the pocket walls in place along the member.