12
Appliance(s) located in a limited space
Combustion air from outdoors by infiltration and ventilation from inside the building
The opening shall have a total free-flow area of not less than 4,4 cm2/kW (1 in2
/5000 BTU/h) of the
total input rating for the appliance(s) located in a limited space.
Each ventilation opening through the inside wall (venting opening of the combustion air and
ventilation opening) shall have a free-flow area of not less than 22 cm2/kW (1 in2
/1000 BTU/h) of
the input rating of the appliance(s) located in the limited space.
4.0 ACCESSORIES INSTALLATION
BLOCKED VENT SWITCH (BVSO)
(FOR CANADIAN INSTALLATION ONLY)
Oil-fired appliances installed in Canada require a blocked vent shut off switch (BVSO) system when
installed on a chimney. A BVSO
Field Controls Model: WMO-1 (Manual Reset)
is included with
the furnace to perform this function. It is the installer’s responsibility to install the BVSO in
accordance with the instructions provided.
