Ductwork; Electric Heater - Napoleon NPFX24A Owner's Manual

Air Handlers

4.5 Ductwork

This air handler is designed for a complete supply and return ductwork system.
Field ductwork must meet the National Fire Protection Association NFPA 90A,
NFPA 90B and any applicable local ordinance.
Sheet metal ductwork run in unconditioned spaces must be insulated and covered
with a vapor barrier. Fibrous ductwork may be used if constructed and installed in
accordance with SMACNA Construction Standard on Fibrous Glass Ducts. Ductwork
must comply with National Fire Protection Association as tested by U/L Standard 181
for Class I Air Ducts. Check local codes for requirements on ductwork and insulation.
Duct system must be designed within the range of external static pressure the unit
is designed to operate against. It is important that the system airflow be adequate.
Make sure supply and return ductwork, grills, special filters, accessories, etc. are
accounted for in total resistance. See fan performance data in this manual.
Do not operate the unit without all ductwork completed.
Do not operate this product without all ductwork attached.
Inadequate ductwork that restricts airflow can result in improper performance and
compressor or heater failure. Ductwork is to be constructed in a manner that limits
restrictions and maintains suitable air velocity. Ductwork is to be sealed to the unit in a
manner that will prevent leakage.
Return ductwork: Do not terminate the return ductwork in an area that can
introduce toxic or objectionable fumes/odors into the ductwork. The return ductwork is
to be introduced into the air handler bottom (up flow configuration).
Return Air Filters: Each installation must include a return air filter. This filtering may
be performed at the air handler or externally such as a return air filter grille.

4.6 Electric Heater

The air handlers listed in this manual do not have factory installed electric heat.
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