STEP 3: Fastening Curb End Support and Curb Center Support Channel
(Items 4 & 5)
Hardware Required: (8) Screws, SMS (A) 12 x 0.625 (IHH)
(1 or 2) Curb Cross Channel
Instructions: • Position the Curb Cross Channel
• Align the holes and fasten using (4) 12 x 0.625 (IHH) screws.
IMPORTANT! The following steps are for ductwork support. These steps are required only
if the ductwork will be installed prior to the ERT unit.
ERT-58 &
ERT-64
ERT-52
ERT-74
2
STEP 2: Assemble Main Curb
Hardware Required: (24 or 32) 3/8-16 x 3/4Serrated Flange Bolts
(24 or 32) 3/8-16 x 3/4Serrated Flange Nuts
(4) Side Channels
(2) End Channels
(1) Center Channel
(2) Supply Side Channels (for ERT-74 only)
Instructions: • See Main Curb Assembly for positioning the Side, Center, and End Channels.
• Align the holes and fasten as shown below.
ERT-74
Side and center channels
fasten together, as shown.
End and side channels
fasten together, as shown.
End
Channel Lengths and Overall Curb Dimensions
Side
Length
End
Length
Center
Length LW
ERT-52 75.25 65.50 65.50 154.50 65.50
ERT-58 88.00 74.75 74.75 180.00 74.75
ERT-64 88.00 74.75 74.75 180.00 74.75
ERT-74 4 @ 59.75 92.75 92.75 195.00 92.75
2 @ 71.25
ERT-52 and ERT-58/64
L
W
L
W
STEP 4: Fastening Duct Cross and Side Channel(s) to Curb Cross
Channels and Main Curb Assembly
Hardware Required: Screws, SMS (A) 12 x 0.625 (IHH)
Quantity: ERT-52
(16) of the above screws are needed to attach the Duct Cross and Side Channels to
the Curb Cross Channel and Main Curb Assembly
ERT-58/64 and ERT-74
(24) of the above screws are needed to attach the Duct Cross and Side Channels to
the (2) Curb Cross Channels
Instructions: • Position the Duct Cross and Side Channels (shown in gray) as depicted
• Align the holes and fasten using the above hardware.
ERT-58 &
ERT-64
ERT-52
ERT-74
3
®® ®
4
All dimensions shown in inches.
