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The FER from Thermolec provides make-up air from 100 to 600 cfm increments with temperature rise capabilities of up to 100°F. All FER units include a washable filter, back-draft damper, speed controllable fan and modulating electric heater. A current sensing relay is included to automatically start the MUA fan when the exhaust fan is energized.
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The NER from Thermolec provides make-up air from 600 to 2,500 cfm with temperature rise capabilities of up to 75°F. NER units include a washable filter, back-draft damper, modulating electric heater and dry contact to start a remote fan. A current sensing relay is included to automatically start the MUA system when the exhaust fan is energized. EP Sales includes the remote fan and speed controller as part of an NER MUA package.
Current IRC and IECC codes require makeup air in residences that have a range hood exhaust fan capable of 400 cfm or larger. Minnesota code requires makeup air for 300 cfm or larger exhaust hoods. In cold climates, designers need to be aware of the additional heating load of 300 cfm or more of outdoor air on a typical winter day. If not handled properly, cold drafts, uneven temperatures and even frozen pipes can result from unconditioned makeup air.
Thermolec’s FER and NER models meet code requirements by automatically providing an equal amount of tempered outdoor air whenever the exhaust fan is turned on. When the fan is off, the backdraft damper shuts off the outdoor air intake, eliminating drafts.
ASHRAE and other commercial codes requiring outdoor air are another excellent application for FER and NER units. Various cfm sizes assure the right amount of fresh air based on the application. Tempering the outdoor air ensures that the building’s heating system does not get overloaded.
The NER makeup air units come with electric heat coils that pre-heat incoming air up to 2,500 cfm, modulating the Btu load saving energy, protecting other pieces of equipment from exposure to undesirable cold temperatures and keeping spaces comfortable. The FER models come with built-in fans and are capable of providing up to 600 cfm of tempered fresh air for a home or business. NER models are available with optional remote fans capable of delivering up to 2,500 cfm with static pressures up to 1.0” WC.
