Specifications

3
Higher volumes of air exhausted by the vent
system result in better overall removal of smoke
and fumes from the kitchen. Longer duct runs
and greater numbers of duct transitions reduce
air volume, therefore it is extremely important
to keep duct runs as short and straight as
possible. When longer runs or multiple turns
are unavoidable, and inline blower may be used
to assist the remote blower.
To ensure that your installation meets this
requirement, add the actual straight length of
duct to the equivalent straight length of all duct
fittings to determine the total equivalent straight
length of duct. (Refer to the table above, which
shows various common duct fittings with their
equivalent straight lengths for various common
duct sizes). If this total equivalent straight
length is less than or equal to the maximum
limits specified, then the installation is proper.
Consider the duct size that corresponds to the
majority of the duct used in the installation.
3 1/4" x 10" 90° Elbow 3 1/4" x 10" 45° Elbow 3 1/4" x 10" Wall Cap 3 1/4" x 10"
90° Flat Elbow
Transistion
3 1/4" x 10" to Round
45° Elbow - Round Duct 90° Transistion
3 1/4" x 10" to 8" Round
90° Elbow - Round Duct
15 Feet 7 Feet 2 Feet 20 Feet
6" Diameter - 4 Feet
7" Diameter - 4 Feet
8" Diameter - 4 Feet
10" Diameter - 4 Feet
6" Diameter - 6 Feet
7" Diameter - 5 Feet
8" Diameter - 3 Feet
10" Diameter - 2 Feet
25 Feet 6" Diameter - 12 Feet
7" Diameter - 10 Feet
8" Diameter - 7 Feet
10" Diameter - 5 Feet
Model
#
Duct
Size
Maximum Equivalent Straight Lengths
REMP3 REMP16 ILB8 w/REMP3 ILB10 & REMP16
ERV/
PRV
8” 60’ - 50’ -
10” - 100’ - 140’
3 1/4”x10” 50’ 60’ 50’ 100’
3. Add (1) and (2) to determine the
total equivalent straight length of the
complete duct system: 25’ + 15’ + 4’
= 44’ total equivalent straight duct
length.
4. For the remote system with 3 ¼” x
10” duct, the maximum allowable total
equivalent straight length of duct is 50
feet. Thus, this proposed installation is
proper.
After determining that your proposed ductwork
meets the maximum duct length requirement,
proceed with the location planning.
Finished floor
3 1/4" x 10"
90¼ Elbow
3 1/4" x 10"
90¼ Elbow
ERV36
Motor cover
Epicure 36"
Cooktop
ERV36
Wall board
Countertop
Anchoring leg
End of ESG
support shelf
3 1/4" x 10”
to round
transition
ILB8/10
REMP3/16
Supplied
Transition
ATD2 (p/n 13768)
Cabinet back
3 1/4" x 10"
Duct
Stud wall
Outside wall
3 1/4" x 10"
to round
transition
Sample problem:
Given a remote system installation having 25
feet of 3 ¼” x 10” rectangular duct, one (1) 90-
degree 3 ¼” x 10” elbow, and one (1) 3 ¼” x 10”
to 8” round transition, would this installation be
proper?
Solution:
1. Add the total length of straight duct:
25’ (of 3 ¼” x 10”) = 25’.
2. Using Table above, determine the
equivalent straight length of all duct
fittings: 90-degree 3 ¼” x 10” elbow =
15’. 3 ¼” x 10” to 8” round transition =
4’.
ERV Raised Floor Island Installation
with ILB in the Subfloor
4. Thermal breaks, such as a
short section of non-metallic
duct, should be used in areas
of extreme cold.
5. A back-draft damper at the duct
outlet may also be required.
6. Do not use flexible metal duct.
7. Do not use ductwork that is
smaller in cross-sectional area
than the recommended size
duct.
8. Do not rely on duct tape alone
to seal duct joints. Use sheet
metal screws as require to
support the duct weight.
9. The vent hood and cooking
appliance(s) must be
removable if service is
required.
10. Be certain that the ductwork
does not interfere with floor
joists or wall studs.
11. It is important to keep a
minimum number of turns in
the duct run, and to keep the
run as short as possible.
12. Do not restrict the air flow
by reducing the duct cross-
sectional areas when making
hard joints or squeezing
through a tight area.
13. With concrete slab
construction, "box-in" the
ductwork to prevent it from
collapsing when the wet
concrete is poured. Also allow
room for electrical conduit.
14. Cross-drafts or air currents
caused by adjacent open
windows or doors, HVAC
outlets, ceiling fans, and
recessed ceiling lights reduce
vent efficiency.
NOTE:
The ILB8 and ILB10 Inline Blowers are only approved as a boost assist to
the REMP3 and REMP16 Remote Blowers.