Burnham Series 4N Boiler Instruccion De Instalación
7
FRONT
OF
BOILER
SMOKEPIPE - DO NOT REDUCE BELOW
SIZE OF COLLAR ON REAR
SMOKEBOX
THIMBLE
FIGURE 1
TYPICAL ARRANGEMENT FOR STUB VENT
TS-71-129-B
5. AIR SUPPLY
A sufficient air supply must be maintained at all
times to the boiler room for proper performance of the
unit. A permanent opening or duct should be provided so
that the boiler input will not exceed 4,000 Btuh/in
2
of free
area.
Example: Firing Rate (Gas) = 528 MBH
528,000 BTUH = 132 In
528,000 BTUH = 132 In
2
Free Area
4,000 BTUH/In
2
Follow local building codes if they exceed these minimum requirements.