16
Figure 18 - Dual V-Bank Filter Plenum
Duct Protection
The nozzle(s) (page 8) is used for the protection of exhaust ductwork and can protect any duct cross-
section type (e.g. round, square, or rectangular). A sufficient quantity of nozzles must be provided to
ensure that no single nozzle coverage exceeds 75" in perimeter.
A single nozzle will protect a duct up to 75” perimeter (22” nominal diameter) and unlimited length. Two
nozzles are required for protection of 75-150” perimeter and unlimited length. A minimum of 3 nozzles is
required for protection of ducts exceeding 150" perimeter (36” nominal diameter) and unlimited length.
When using multiple nozzles (modular protection), the coverage area for each nozzle must not exceed 75"
perimeter.
Figure 19 - Nozzle Duct Protection
*Isolated Plenum Place for Clarity
TOP VIEW
*Isolated Plenum Place for Clarity
SIDE VIEW
4' Max
10' Max
0-6"
Plenum
Nozzle
Plenum
Nozzle
4' Max
Height
Filter
Filter
Plenum
Nozzle
1. Duct
2. Hood
3. Single Nozzle
4. Dual Nozzle
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