Use a jump duct (Figure 2) or transfer grille (Figure 3), so warm air from the house is pulled into the closet, warming the closet.
Caption: FIGURE 3 Transfer Grille. Warm air from the house is pulled into the closet, warming the closet.
The only exception occurs when the hood at the corner is adjacent to a transfer grille
. In this case, the jet from the transfer grille
that passes just above and in front of the sash opening falls down into the working zone of the hood as it mixes with the cool supply air from the diffuser.
Sizing the transfer grille is somewhat tricky because the return air plenum is also negatively pressurized.
(4.) "Discussion of the Use of Transfer Grilles to Facilitate Return Air Flow in Central Return Systems." http://tinyurl.com/o4sghcf; and "Discussion of the Use of Transfer Grilles to Facilitate ReturnAir Flow in Central Return Systems." http://tinyurl.com/ovabs66 are two examples.
This is accomplished with mechanical ventilation systems, which include transfer grilles
in each room to relieve the room's pressure while keeping the airflow at a predetermined rate.
Project coordinators paid special attention to product off-gassing in this house by incorporating elements like 100 percent nylon carpet, low-emission cabinets, air transfer grilles
over interior doors, and zero-volatile organic compound (VOC) wall paint.
He pushed mastic and duct testing ** and pressure balancing via jump ducts (Figure 2a) and transfer grilles
Use transfer grilles
and transoms to bleed the pressure from rooms with doors (Figure 3).