Easy Radiant Works Middleman EZM-90-40, Manual

Page: 22 / 40

22
UNVENTED INSTALLATION (INTERLOCKED INDIRECT VENTING)
This appliance is certified for installation without a direct exhaust vent connection to the
outdoors, subject to the following criteria.
CANADA:
It is required that the heaters(s) be electrically interlocked to dedicated
exhaust fan(s) by means of an Air Proving Switch. Exhaust fan(s) must be sized to
create 300 cfm (8.5 cu m/min) exhaust for every 100,000 BTUH (30 kW), or a fraction
thereof of total input, of installed equipment. Exhaust must be located as high as
practicable in the structure above the level of the heater(s). Sufficient supply air must be
provided. Consult the latest edition of CSA.B149.1 Section 8 for venting system and air
supply requirements.
USA:
Natural or mechanical means shall be provided to supply and exhaust at least
4ft
3
/ min/1000Btuh (0.38m
3
/min/kW) input of installed heaters. Some local codes may
require an electrical interlock to a dedicated exhaust fan.
Exhaust must be located as high as practicable in the structure above the level of the
heater(s). Consult your local code and ANSI Z223.1 latest edition for all venting
requirements and practices.
UNVENTED INSTALLATION IN AGRICULTURAL APPLICATIONS
When installed in a large and adequately ventilated space (agricultural building used
only for brooding purposes) the heater may be installed un-vented without
interlocking to an exhaust fan, and may be operated by discharging the combustion
products directly into the space, subject to the approval of the authority having
jurisdiction and provided that the maximum input of the appliance does not exceed 20
BTUH ft
3
(0.2 kWm
3
) of the space in which the heater is located. An environment control
system that maintains and monitors a controlled atmosphere need not be subject to
these conditions.