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Ultra-Aire MD33 Installation Instructions
www.InWallDehumidifier.com | (800) 533-7533
MAINTENANCE
Filter Maintenance
The Ultra-Aire MD33 comes with a washable filter. Check filter every two months. Clean or replace the filter as
necessary.
Removing the Filter:
Remove the screws on the front cover and then push the front cover up gently to free the cover hooks from the
chassis. Filter is located on the back side of the front cover. Gently remove the filter by lifting the bottom side
corners first to prevent bending it.
Filter Cleaning:
The filter can be vacuumed with a wet / dry vac or washed with warm water.
Reinstalling the Filter:
Insert the filter into the tabs on top of mount and flex the filter to insert it into the bottom tabs. Reinstall the cover
by lining up the tabs, sliding down into place, and secure with included tamper resistant or phillips screws.
WARNING!
BE SURE THE UNIT IS POWERED OFF AND UNPLUGGED OR CIRCUIT BREAKER
IS TURNED OFF BEFORE REMOVING THE FRONT COVER TO SERVICE THE
UNIT; IF THE SUPPLY CORD IS DAMAGED, IT MUST BE REPLACED BY THE
MANUFACTURER, ITS SERVICE AGENT OR SIMILARLY QUALIFIED PERSONS
IN ORDER TO AVOID A HAZARD.
AVERTISSEMENT!
ASSUREZ-VOUS QUE L’UNITÉ EST FERMÉE OU DÉBRANCHÉE OU QUE LE CIRCUIT
D’ALIMENTATION EST FERMÉ AVANT DE RETIRER LE PANNEAU AVANT POUR
ENTRETENIR L’UNITÉ.
AIR FLOW
Supply Air
Return Air
Supply Air
Supply Air
Return Air
Return Air
The Ultra-Aire MD33 functions by drawing
moist air in through the bottom portion of
the diffuser and returning dried air to the
space out the top portion of the diffuser.
Note:
Avoid blocking the return and
supply air flow to maximize unit
performance and prevent heat build
up. Furniture must be at least 6"
away from the diffuser.
Diffuser Maintenance
It is recommended to use a mild detergent to clean the surface of the diffuser, especially around the edges where
the return air is flowing into the unit (see illustration below). This is where air is being drawn into the filter and may
collect dust. Do not use harsh solvents on the diffuser.
The diffuser can be painted to blend in with interior aesthetics. Use only paint that is recommended for
polycarbonate surfaces and follow the manufacturer’s recommendations for surface prep and application.
