General Venting │ Vmax I&O Manual
4.0 GENERAL VENTING
The Vmax VM110 & VM110P are certified as a “Category IV” boiler requiring a “Special Venting System”
designed for pressurized venting. The Exhaust Vent must be piped to the outdoors, using the vent materials and
rules outlined in this section. Under no conditions may this unit vent gases into a masonry chimney, unless it is
vacant, and utilizes the approved venting material and rules described in this section.
Vent and Air-inlet are to be piped separately. The Vmax VM110 & VM110P cannot share
a common vent or air-inlet with multiple boilers. Failure to comply will result in serious
injury or death.
Direct Vent Installation (Best Practice)
When installed as a Direct Vent boiler the combustion air-inlet must also be piped directly to the outdoors using
the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or
CSA B149.1 (Canada) and local requirements.
Installation Using Indoor Combustion Air
When the installation uses Indoor Combustion Air (i.e. piping is not directly connecting the appliance air-inlet
fitting to the outdoors), provisions for combustion and ventilation air, in accordance with section “Air for
Combustion and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (U.S.), or Clause 8.2, 8.3
or 8.4 of Natural Gas and Propane Installation Code, CAN/CSA B149.1 (Canada), or applicable provisions of
the local building codes, must be adhered to.
The boiler shall be located so as not to interfere with proper circulation of combustion,
ventilation, and dilution air.
Make up air requirements for the operation of exhaust fans, kitchen ventilation systems,
clothes dryers, and fireplaces shall be considered in determining the adequacy of a space
to provide combustion air requirements. Failure to ensure adequate make up air to all
appliances may result in personal injury or death.
Combustion Air-inlet Contamination
Be careful not to locate the air-inlet termination in an area where contaminants can be drawn in and used for
combustion. Combustion air containing dust, debris or air-borne contaminants will drastically increase the
required maintenance and may cause a corrosive reaction in the Heat Exchanger which could result in premature
failure, fire, serious injury, or death. See Table 4-1 for a list of areas to avoid when terminating air-inlet piping:
Table 4-1 Corrosive Products and Contaminant Sources
Contaminated Sources to Avoid
Antistatic fabric softeners, bleaches, detergents, cleaners
Perchloroethylene (PCE), hydrocarbon based cleaners
Chemical fertilizer, herbicides/pesticides, dust, methane gas
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, fiberglass, cleaning solvents
Auto body or metal working shops
Refrigerant charge with CFC or HCFC
Fixer, hydrochloric acid (muriatic acid), bromide, iodine
Photo labs, chemical / plastics processing plants
Cement powder, crack fill dust, cellulose, fiber based insulation
Concrete plant or construction site
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this
or any other boiler. Failure to follow instructions may result in serious injury or death.
It is BEST PRACTICE to pipe the combustion air-inlet directly to the outdoors (Direct
Vent installation) to avoid contamination often contained in indoor air.
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