Best 634 Installation manual

6” - 8” ROUND OR 3¼” x 10” ROOF CAP

INSTALLATION & MAINTENANCE INSTRUCTIONS

INSTALLATION

Plan installation carefully. Before installing roof cap, make
sure that birdscreen is in place. Refer to Figure 3 under “MAIN­TENANCE” section.

Roof cap will accept up to 3¼” x 10” rectangular or 8” round
duct. Ductwork may enter roof cap as shown in Figures 1A &
1B. Tape all joints with duct tape to prevent air and water
leaks.

Figure 1A

Figure 1B

MAINTENANCE

To replace damper flap or gasket material:

1. Remove birdscreen, using sharp pointed tool. Pull screen
down and pop it out. (Figure 3)

2. Remove screw (Item #8) in center of damper plate assem­bly and pull assembly out.

3. Pull out damper rod and lift damper flap out.

4. Replace defective or worn parts and reinstall damper flap
with rib in flap facing up.

5. Slide damper plate assembly into grooves on inside of cap
and replace screw. Make sure that damper opens freely.

6. Replace screen and position as shown.

NOTE: The high quality paint coating on our outdoor acces­sories may be used as the exterior finish or as a prime coat
for the finish of your choice. Apply the coating best suited for
the special conditions of your application.

Housing (Painted) 97006176
Housing (Aluminum) 97006250

Figure 3

Damper Flap

Damper
Rod
98005576

98005581

Bird Screen
98005577

1. Cut hole in roof approximately ½” larger than ductwork.

2. Insert ductwork through opening and run it back to fan or
range hood. Leave a maximum of ¾” of duct projecting
above roof surface on the high side.

3. Trim ductwork parallel to roof pitch.

Figure 2

ROOF CEMENT

(Seal shingles to roof cap

on sides and top)

NAILS

(Seal all nail heads with roof cement)

4. Carefully lift shingles and slide back flange of roof cap
under shingles. Nail flange to roof under shingles at top
two corners and two sides. Nail directly to roof in four
places at bottom. (Figure 2)

Short Sealant
Strip 99500322

Long Sealant
Strip 99500321

Damper Plate (Painted) 98005584
Damper Plate (Aluminum) 98005598

Screw (Black) 99170245
Screw (Silver) 99150576

5. Use roof cement to seal shingles to top and sides of roof
cap. Seal all nail heads with roof cement as well.

99040511G