Greenheck Fan Make-Up Air Unit VSU - Manual (Page 4)

4 Model VSU Make-Up Air
® ® ® ® ®
2. Burner/Blower Section
Use a crane and a spreader bar hooked to the factory
lifting lugs (shown below)
to lift and center the unit
onto the filter stand section. The sections can be
caulked together, but it is not needed with the water
kickouts provided with this section.
3. Install Ductwork
This table shows the duct sizes and straight lengths
recommended for optimal performance (AMCA
Publication 201-90). Using duct sizes less than
recommended will affect fan performance. Good
duct installation practices should be followed for
the remaining ductwork. See the drawings in the
Dimensional Data section for duct locations.
Recommended Supply Ductwork Sizes
VSU
Blower Size
Duct
Size
Straight Duct
Length
220 68 x 26 inches 117 inches
Installation
continued 4. Complete Installation
A typical horizontal discharge installation is shown.
Gas and/or electrical lines can be connected at this
time.
For upblast units, a duct elbow may be needed to
turn the ductwork into the building. Follow proper
ductwork methods recommended by AMCA to make
this elbow to minimize duct losses.