Robur GAHP-W, Installation, Use And Maintenance Manual, Page: 20 / 68

GAHP-W – Installation, start-up, use and maintenance manual
18
Edition: 2014-08
o
Each of the two openings should be sized based on a minimum free area of
one square inch per 2000 Btu/hr.
Figure 5
- Air taken from another interior space, each of the two openings specified below should
have a net free area of one square inch for each 1,000 Btu/hr of input, but not less
than 100 square inches.
Figure 6
GAHP-W Input Outside air 2
openings Outside air 1
openings Inside air 2
openings Outside air
through 2 ducts
95,500 Btu/h 24 in^2 32 in^2 96 in^2 48 in^2
Table 10
Outside air openings shall directly open to the outdoors. The above requirements are for
the appliance only, additional gas fired appliances in the mechanical room will require an
increase in the net free area to supply adequate combustion air for all appliances.
Combustion air requirements are based on the latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada refer to CSA International CAN/CGA B149.1 or B1 49.2
Installation Code.Check all local code requirements for combustion air.