Ductwork - Bosch BVA 15 Series Installation Instructions Manual

1 6 | Bosch IDS BVA 15

6 Ductwork

Field ductwork must comply with the National Fire Protection Association NFPA
90A, NFPA 90B and any applicable local ordinance(s).
WARNING: FIRE HAZARD AND CARBON MONOXIDE
 Do not, under any circumstances, connect return ductwork
to any other heat producing device such as fireplace insert,
stove, etc. Unauthorized use of such devices may result in
fire, carbon monoxide poisoning, explosion, personal injury
or property damage.
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 airflow
performance tables in Section 5 of this manual.
Design the duct system in accordance with "ACCA" Manual "D" Design

for Residential Winter and Summer Air Conditioning and Equipment
Selection. Latest editions are available from: "ACCA" Air Conditioning
Contractors of America, 1513 16th Street, N.W., Washington, D.C.
20036. If duct system incorporates flexible air duct, be sure pressure
drop information (straight length plus all turns) shown in "ACCA" Manual
"D" is accounted for in system.
Supply plenum should be attached to the 3/4" duct flanges supplied with

the unit. Attach flanges around the blower outlet.
If an elbow is included in the plenum close to the unit, it must not be
smaller than the dimensions of the supply duct fl ange on the unit.
The front flange on the return duct (if connected to the blower casing)
must not be screwed into the area where the power wiring is located.
Drills or sharp screw points can damage insulation on wires located
inside unit.
Secure the supply and return ductwork to the unit flanges, using proper

fasteners for the type of duct used and tape the duct-to-unit joint as
required to prevent air leaks.
Data subject to change
Installation Instructions
10.2020 | Bosch Thermotechnology Corp.