Bradford-White Corp Powered Direct Vent Series To calculate total equivalent feet

Venting continued-

This water heater is a power direct vented appliance and is designed to intake and exhaust its products of combustion through 3” (7.6 cm) or 4” (10.2 cm) diameter Schedule 40 PVC pipe to the outdoors. This water heater may intake and exhaust either through the wall or vertically through the roof. Use a 3” (7.6 cm) to 4” (10.2 cm) reducer to connect to the intake and outlet when using 4” (10.2 cm) PVC. Table 2 lists the maximum intake and exhaust lengths for this water heater using 3” (7.6 cm) PVC. If possible, locate the water heater so that the venting length and number of elbows are kept to the minimum distance necessary to reach the outside. If the installation requires venting lengths that exceed the lengths listed for 3” (7.6 cm) PVC in Table 2, then use 4” (10.2 cm) PVC for the vent connector. Table 3 lists the venting distances allowed with 4” (10.2 cm) diameter PVC pipe. When venting with 4” (10.2 cm) PVC, use a 4” (10.2 cm) to 3” (7.6 cm) reducer to exit through the building wall with 3” (7.6 cm) PVC. Use the 3” (7.6 cm) vent terminal supplied with the water heater to terminate on the outside of the building. If the length of the 3” (7.6 cm) PVC needed to go through the wall is greater than 14” (35.5 cm), use 4” (10.2 cm) PVC to go through the wall and reduce to 3” (7.6 cm) PVC immediately after exiting the outside wall. Refer to the venting illustrations on the following pages. Make sure the vent pipe terminal elbow fittings are at least 1” (2.5 cm) away from the edge of the wall.

To calculate total equivalent feet

Add up the total number of 90° elbows on the intake and the exhaust, and multiply by 5 feet (1.5 m) (each 90° elbow is equivalent to 5 feet (1.5 m) of straight pipe). To this number add the total number of feet of straight pipe on the intake and the exhaust. This sum (total of all 90° elbows at 5 feet (1.5 m) each, plus total number of feet of straight pipe) must not exceed 80 feet

(24.4 m). All elbows must be included in the calculation except those on the extreme ends of the intake and exhaust. 45° elbows may also be used. When using 45° elbows, take the total number of 45° elbows on the intake and exhaust and multiply by 2 1/2 feet (.76 m) (each 45° elbow is equivalent to 2 1/2 feet (.76

m)of straight pipe).

Total equivalent feet=

(# of 90° elbows x 5) + (# of 45° elbows x 2 1/2) + (total feet of straight pipe)

Total equivalent meters=

(# of 90° elbows x 1.5) + (# of 45° elbows x .76) + (total meters of straight pipe)

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