FloAire PCU Filtration - Manual (Page 7)

7
Recommended MIN Ductwork Sizes
PCU Size Duct Height Duct Width
PCU-1 23 in. 23 in.
PCU-2 30 in. 30 in.
PCU-3 35 in. 35 in.
PCU-4 43 in. 43 in.
PCU-5 50 in. 52 in.
PCU-6 46 in. 58 in.
Ductwork
The ductwork attached to this unit will significantly
affect the airflow performance. Flexible ductwork
and square elbows should not be used.
There
must be at least 3 duct diameters of straight
duct leading to the inlet and at the outlet of the
pollution control unit.
The chart to the right
shows the recommended duct sizes for optimal
performance.
The maximum velocity at the inlet
of the pollution control unit must be less than
1000 feet per minute for light duty applications
and less than 800 feet per minute for heavy
duty applications and solid fuel applications.
Follow SMACNA guides and recommendations for the remaining duct run.
Ensure duct connections are properly aligned and sealed. When the pollution control unit is used in
commercial grease ductwork, the ductwork connections must be FULLY WELDED to the PCU. Ductwork
must be listed or installed in accordance with the IMC. When pollution control unit is installed in grease
rated ductwork, the clearance to combustible surfaces to this pollution control unit is 18 in.
Unit Drains
Each module of the Pollution Control Unit contains a drain that must be connected to an approved
grease interceptor or to an approved drainage point. The drain connections must be made with Black
Iron or Stainless Steel piping. This will allow the water collected in the unit, either from Self Cleaning
hood, ductwork cleaning, or from the Core Protection Fire System, to drain away from the unit. If installed
outdoors, the drains must be piped so that water cannot buildup in the pipes and burst due to freezing.