Warning
In areas of high snowfall, users must be advised to check side wall vent and air intake
terminations on a regular basis to ensure blockage does not occur.
3.5.8 Direct vent combustion air intake piping
The direct vent option uses piping from the outside to supply combustion air directly to the boiler’s
combustion air connection. Combustion air piping - if used - is inserted directly into the 4" PVC-sized
fitting, and increased immediately to 6".
At a new construction site, or during renovations, action must be taken to protect the boiler from drywall
dust or other construction related contaminants; combustion air should be drawn from a clean source
(e.g. outdoors) and the boiler should be isolated from interior dust sources. Do not seal boiler case
openings directly when firing - allow for air circulation and ventilation in the immediate area.
Known Corrosive Contaminants to Avoid
Cements and glues
Paint or varnish removers
Adhesives used to fasten building products and other similar products
Chlorinated waxes or cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for snow and ice clearing
Sodium chloride or potassium chloride used for water softening
Refrigerant leaks from cracks in coils
Hydrochloric acid or muriatic acid used in household cleaning and stain removal
Chemicals in perming solutions
Chlorofluorocarbon chemicals found in spray cans
Chlorine-type bleaches, detergents, and cleaning solvents found in household laundry rooms
Antistatic dryer sheets in clothes dryers
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