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Model
MFNH060
MFNH100
MFNH150
MFNH200
MFNH250
MFNH300
MFNH400
MFNH500
MFNH600
3
PROVIDE AIR FOR COMBUSTION AND VENTILATION
Provisions for combustion and ventilation air must be in accordance with:
•
Section 5.3. Air for combustion and Ventilation, of the latest or current as amended National Fuel
Gas Code, ANSI Z223.1, or;
•
Sections 7.2, 7.3 or 7.4 of CAN/CGA B149 Installation Codes, and;
•
Applicable provisions of the local building codes.
The operation of exhaust fans, compressors, air handling units etc. can rob air from the room, creating a
negative pressure condition leading to reversal of the natural draft action of the venting system. Under
these circumstances an engineered air supply is necessary.
If the heater is to be installed near a corrosive or potentially corrosive air supply, the heater must be
isolated from it and outside air should be supplied as per code.
Potentially corrosive atmospheres will result from exposure to permanent wave solution, chlorinated
waxes and cleaners, chlorine, water softening chemicals, carbon tetrachloride, halogen based
refrigerants, Freon cleaning solvents, hydrochloric acid, cements and glues, masonry washing materials,
antistatic fabric softeners, dry cleaning solvents, degreasing liquids, printing inks, paint removers, etc.
Table 2: Appliance Dimensions, (inches)
'W'
18 3/4
1 1/2
18 3/4
1 1/2
18 3/4
1 1/2
18 3/4
1 1/2
25
1 1/2
25
1 1/2
31 1/2
2
31 1/2
2
36 1/2
2
3
B' Dia. Venting
1/2
3
3
3
1/2
3
3
4
1/2
3
3
4
3/4
4
4
5
3/4
4
4
5
3/4
5
5
6
1
5
5
6
1
6
6
7
1
6
6
7
E' Dia.
3
3
3
4
4
5
5
6
6
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