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8
Installation & Operation Instructions 800.558.1711
The recommended installation creates a separate return for the B70DHV in a central area of the
structure. Duct the supply of the unit to the air supply of the existing HVAC system. Connect an insulated
duct from outside to provide fresh make-up air (optional).
DUCTING TO HVAC SYSTEMS
CAUTION!CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT (800) 558-1711 FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All exible ducting connected to the B70DHV should be UL listed.
• A short piece of exible ducting on all B70DHV duct connections is recommended to reduce noise and
vibration transmitted to rigid ductwork in the structure.
• Use a minimum 8" diameter round or equivalent rectangular duct for total duct lengths of up to 25'. Use a
minimum 10" diameter or equivalent for longer lengths.
• Grills or diusers on the duct ends must not excessively restrict airow.
• A length of 8" or more of insulated ex duct or any other vibration isolating material on the outlet of the
B70DHV will reduce air noise from the blower.
• Eective dehumidication may require that ducting be branched to isolated, stagnant air ow areas. When
ducting to two or three areas, use 6" or larger diameter branch ducting. When ducting to four or more
areas, use 4"-6" or larger diameter branch ducting. Provisions must be made to provide airow from
supply locations to the central return location. Proper air distribution is important to ensure even humidity
control and heat distribution throughout the structure.
• DO NOT locate the return in a bathroom or a kitchen.
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