STEP 7 — Nail frame assembly securely in place with 2 x 2 furring strips. See Fig. 17. Put moulding around outside of shutter as shown in Fig. 17. Moulding should be at least 4” wide. Caulk around moulding to provide a
STEP 8 — Wire fan to 120V power supply and
STEP 9 — Fan installation is now complete. With control in “OFF” position turn on 120V power supply to fan. Test run fan through all speeds.
FIG. 12 | FIG. 13 | FIG. 14 |
FIG. 15
FIG. 16 | FIG. 17 |
|
DOUBLE 2 X 6
HEADER
2 X 4 FRAMING
SECURE UNIT IN PLACE
WITH 2” X 2” FURRING
STRIPS INSIDE
FRAME HOLE AT
37” X 37”
SECURE UNIT IN PLACE
OUTSIDE WITH MOULDING
ATTIC AIR INTAKE AND DISCHARGE
Your wholehouse ventilator will be discharging a large volume of air into the attic every minute. It is obvious that provisions must be made to allow this air to escape to the outside. The sketches below illustrate several different types of exhaust vents that are in common usage. Of these types, the
Each size fan requires a given amount of minimum outlet in order to insure quiet operation and unrestricted air movement. The table below shows the minimum area to be provided for each fan, and the increased size that is required if the outlet is restricted with louvres, screening, etc.
Sufficient outlet air is most important. Unless enough is provided, the fan will be overloaded, and the motor will run hot, causing the ther- mal protector to turn it off. When it cools, it will start again. Such intermittent operation is usually an indication of too little outlet air or too little input air through the house.
MINIMUM ATTIC DISCHARGE AREAS REQUIRED
(All areas are in square feet)
FAN | UNRESTRICTED* | WOOD LOUVER* | METAL LOUVER* |
SIZE | OPENING REQD. | OPENING REQD. | OPENING REQD. |
24” | 8.5 | 19.2 | 15 |
B (Ft.) |
|
| B (Ft.) |
|
|
| |
|
| B (Ft.) |
|
A (Ft.) |
|
|
|
(1/2 A x B = AREA Sq. Ft.) |
| A (Ft.) |
|
GABLE EXHAUST |
| A (Ft.) | |
| (A x B = AREA Sq. Ft.) | ||
|
| GABLE EXHAUST | (A X B = AREA Sq. Ft.) |
|
|
| EAVE |
|
|
| EXHAUST |
— 6 —
