Raypak 055B Vent Piping, OR LESS VENT CAP 2 MIN 2 MIN 5 MIN VENT PIPE DRAFT HOOD HEATER

VENT PIPING

WARNING: Indoor boilers require a draft hood that must be connected to a vent pipe and properly vented to the outside. Failure to follow this procedure can cause fire or fatal carbon monoxide poisoning.

Vent piping the same size or larger than the draft hoodoutletisrecommended,however,whenthetotalvent height is at least ten (10) feet (draft hood relief opening to vent terminal), the vent pipe size may be reduced as specified in Chapter 10 of the latest edition of the National Fuel Gas Code, ANSI Z 223. (Canada-CAN/CGA- B149.1 and B149.2). As much as possible avoid long horizontal runs of vent pipe and too many elbows. If installation requires horizontalor or non-vertical runs, the vent pipe must have a minimum of 1/4 inch per foot rise and should be supported at not less than five foot intervals. Plumbers tape, criss-crossed, will serve to space both horizontal and vertical piping. Gas vents supported only by the flashing and extending above the roof more than five feet should be securely guyed or braced to withstand snow and wind loads. We recommend use of insulated vent pipe spacer through the roofs and walls.

For protection against rain or blockage by snow, the vent pipe must terminate with a vent cap which complies with the local codes or, in the absence of such codes, to the latest edition of the National Fuel Gas Code, ANSI Z223.1-1988 (Canada-CAN/CGA-B149.1 and B149.2).

The discharge opening must be a minimum of two feet vertically from the roof surface and at least two feet higher than any part of the building within ten feet. Vent stack shall be at least five feet in vertical height above the draft hood outlet. The vent cap location shall have a minimum clearance of 4 feet horizontally from, and in no case above or below, unless a 4-foot horizontal distance is maintained, from electric meters, gas meters regula- tors and relief equipment.

The weight of the vent stack or chimney must not rest on heater draft hood. Support must be provided in compliance with applicable codes. The heater top and draft hood must be readily removable for maintenance and inspection. Vent pipe should be adequately sup- ported to maintain proper clearances from supported to maintain proper clearances from combustible construc- tion.

Type "B" double wall or equivalent vent pipe is recommended. However single wall metal vent pipe may be used as specified in the latest edition of the National Flue Gas Code ANSI Z 223.1-1988 (Canada-CAN/CGA- B149.1 and B149.2).

10' OR LESS

VENT CAP

2' MIN

2' MIN

5' MIN

VENT PIPE

DRAFT HOOD

HEATER

10