Raypak 335, 185, 405, 265 installation instructions Venting, Reduced Maximum Equivalent Vent Run feet

VENTING

The vent pipe must be the same size or larger than what is indicated. The D-2 Power Vent are capable of 360-degree discharge rotation and operate with a positive vent static pressure and with a vent gas temperature less than 400°F. The total length of horizontal run shall not exceed an equivalent of 40 feet including termination cap. For all cases, each 90-degree elbow reduces the maximum horizontal vent run by 10 feet and each 45-degree elbow in the vent run reduces the maximum vent run by 5 feet. See the table for maximum vent lengths using 90-degree and 45-degree elbows. The D-2 Power Vent uses positive pressure to push flue gases through the vent pipe to the outside. The vent must be installed to prevent the flue gas leakage. Care must be taken during assembly to insure that all joints are sealed properly and are airtight.

The vent must be installed to prevent the potential accumulation of condensate in the vent pipes. It is recommened that:

a)The vent be installed with a slight downward slope of not more than 1/4” per foot of horizontal run to the vent terminal.

b)The vent be insulated through the length of horizontal run.

For appliances installed in extreme cold climate, it is recommended that:

a)The vent be installed with a slight upward slope of not more than 1/4” per foot of horizontal run to the vent terminal. In this case, an approved condensate trap must be installed per applicable codes.

b)The vent be insulated through the length of the horizontal run.

Reduced Maximum Equivalent Vent Run (feet)

	90 degree elbows		45 degree elbows
Quantity		Maximum Length	Quantity	Maximum Length
1		30	1	35
2		20	2	30
3		10	3	25

Fig #9357

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