Venting Part 4 If all contaminants listed in Table 2.1 in the installation manual are STRICTLY AVOIDED, combustion
room can be used as a source of air intake. This table is shown again below.
Note: In new home installs it is mandatory to bring air in from outside the home while the home is being built. This is
in done to prevent dust and any other contaminants from entering the boiler housing and affecting operation.
Table 2-1 - Corrosive Products and Contaminant Sources
Contaminated Sources to Avoid
Antistatic fabric softeners, bleaches, detergents,
Perchloroethylene (PCE), hydrocarbon based cleaners
Chemical fertilizer, herbicides/pesticides, dust,
Farms or areas with livestock and manure
Paint or varnish removers, cements or glues, sawdust
Wood working or furniture refinishing shops
Water chlorination chemicals (chloride, fluoride)
Solvents, cutting oils, fibreglass, cleaning solvents
Auto body or metal working shops
Refrigerant charge with CFC or HCFC
Fixer, hydrochloric acid (muriatic acid), bromide,
Photo labs, chemical / plastics processing plants
Cement powder, crack fill dust, cellulose, fibre based
Concrete plant or construction site
.
Vent/Air-Intake Pipe Length Determination
Use table 3.1 to determine the maximum pipe length that can be used. The table calculates pipe length with
regard to use of 90º elbows, and 45º elbows. Allowable pipe lengths for vent and air-intake pipes are shown for
Natural Gas.
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