Warmair and Ventilation Systems

Normally, wall studs and joists are located so that they do not have to be cut to install heating ducts. When ducts must pass up through a wall to heat the room above, the top and bottom plates must be removed at these points, and the ducts are then fitted between the studs.

When a partition is supported on doubled floor joists and a heating duct is to go in the partition, the joists are ordinarily spaced apart, with blocking, to allow room for the duct. This eliminates the need to cut framing members unnecessarily or to use intricate duct angles.

Return air grilles, usually located on inside walls near the floor level, can be connected to a duct or an enclosed stud space. At this point, the bottom plate and subfloor is cut to make a passage for the duct or air space. Blocks are nailed between the joists to support the ends of boards if diagonal subflooring has been used. Sometimes, the studs have to be cut to accommodate large return air grilles.

Basement plan showing typical heating layout.

Basement plan showing typical heating layout.

bedrooms dining room basement up to toe space in kitchen counter return air duct copper tubing carried in concrete floor and connected to burner oil feed and vent pipes oil storage tank living room entrance hall bathroom bedroom basement bedroom basement bedrooms dining room basement up to toe space in kitchen counter return air duct

(m copper tubing carried in concrete floor and connected to burner oil feed and vent pipes oil storage tank living room entrance hall bathroom

Where this occurs, a lintel is used to support the studs that have been cut, and the opening is framed in the same way as the door opening shown in Figure 42. When enclosed, the space between the floor joists may be used as a return air duct and other return air ducts connected to the same joist space. Non-combustible material, such as metal, should be used to line the joist space within 24 in. (600 mm)

of the furnace, under floor registers, and at the bottom of vertical ducts.

Warm-air registers are usually placed in the floor close to the outside walls, preferably under the windows. These registers are fitted with vanes to direct the warm air over the wide area of the outside walls. Where possible, ducts leading to these registers are located between joists with a shaped "boot" connecting the duct and regis-

Isometric view of typical heating unit.

baseboard return air grille

(m wiring from relay control box extended to thermostatic wall control outlet generally located 4' (1.2 m) off first floor level furnace wiring extended to emergency switch box normally fixed to underside of floor joists at bottom of basement stairs wiring from relay control box extended to thermostatic wall control outlet generally located 4' (1.2 m) off first floor level furnace wiring extended to emergency switch box normally fixed to underside of floor joists at bottom of basement stairs return air — one or two joist spaces with bottom and end boxed-in with sheet metal generally 3" (75 mm) clearance required from wood members

warm air supply extended plenum warm air take-off floor joists plenum strap supports smoke pipe barometric damper copper tubing from burner unit looped and taken in concrete slab to oil storage tank return air — one or two joist spaces with bottom and end boxed-in with sheet metal generally 3" (75 mm) clearance required from wood members warm air supply extended plenum warm air take-off floor joists plenum strap supports smoke pipe barometric damper relay control box heating unit conduit fastened to heating unit copper tubing from burner unit looped and taken in concrete slab to oil storage tank ter. Then, only the subfloor and floor covering need to be cut. Diagonal subflooring must be supported by blocking at this point.

In houses with a crawl space, a warm-air furnace can either be put in a special compartment on the floor of the house, hung under the floor or mounted on a concrete base in the crawl space beneath the house. In the first two cases, the joists will have to be designed to carry the weight of the furnace.

Ventilation is often coupled to the warm air heating system of the house, using the heating ducts to also distribute ventilation air. In some cases, particularly for houses without forced air heating systems, dedicated, whole-house ventilation systems are used. These systems often require ducts that are smaller than those required for used for heating purposes. They are accommodated by the framing in a manner similar to the warm air systems.

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