Specifications

APRILAIRE EVAPORATIVE
Aprilaire Evaporative
Humidification
Residential evaporative humidifiers are generally designed
in one of two styles, bypass or fan powered. The design
difference is how the air is delivered to the humidifier.
In the bypass design air is passed from the supply to the
return and the powered version uses a fan to blow air
through the unit.
At the heart of the fan powered and bypass humidifier is
the Water Panel evaporator. Dry, hot air from the HVAC
system is moved through the moisture-laden Water
Panel where natural evaporation takes place. The now-
humidified air carrying moisture in vapor form (nature’s
own way) is circulated through out the home.
EVAPORATIVE HUMIDIFIERS OFFER THE
FOLLOWING BENEFITS:
• Easy to maintain
• Long life – trouble free
• Ease of installation
• Convenience
Easy to maintain
It takes a couple of minutes to remove the old water panel
and replace. For best performance it’s recommended the
water panel be replaced annually.* It’s really that simple.
Remove the old water panel and replace with the new
panel and your done. Easy!
Long life – trouble free
Trouble free performance and minimum maintenance are
assured by the design features of the Aprilaire evaporative
humidifier. All humidifier housing parts that come in
contact with water are non-metal and will never rust or
corrode. Neither heat nor water will affect them under
normal operating conditions.
Periodic preventative maintenance should be conducted
on the distribution tray directly on top of the water panel.
It should be inspected annually and cleaned of excess
mineral deposits. Yearly inspection of the feed tube and
periodic cleaning of the orifice is all that’s needed to
extend the life of the humidifier. If properly maintained an
evaporative humidifier will last longer than the HVAC
system it’s installed on.
Ease of Installation
Evaporative humidifiers mount directly on the plenum
of the HVAC system. Although installation is easy, it’s
recommended that a professionally trained HVAC contractor
install the products. Aprilaire offers NATE
®
certified training
classes that ensure contractors are properly trained. Look
for the Aprilaire Indoor Air Quality specialist branding.
Convenience
The components that require significant cleaning can
simply be replaced. Replacing a water panel every year is
much easier and cost effective compared to hours of
cleaning. In fact many contractors will replace the water
panel as part of a scheduled maintenence program for
the HVAC system.
*Twice per humidifier season for the Model 400