Greenheck Blade Seal Replacement (HCD Series) - Manual (Page 2)

Silicone or EPDM Seal with Pressure Sensitive
Adhesive (PSA)
• Open blades. Use scraper to remove any existing seal or
adhesive.
• Surface must be free from dust, dirt, oil and moisture.
Clean blade edge with alcohol or similar solvents. Do
not use mineral spirits or other petroleum based solvents
that leave a residue.
• Install when blade surface is above 70°F or above.
• Cut seal material slightly longer than blade with release
paper still on seal material.
• Start at one end of blade. Peel off 1-2 feet of release
paper at a time and place seal firmly onto blade surface.
Do NOT touch the adhesive. Use finger or roller to press
seal to blade. Do NOT stretch seal as it will pop off in
time.
• Trim seal material at blade end as required. Excess seal
is prone to pulling from blade surface and will force jamb
seal away, increasing leakage.
Silicone Seal with Silicone Adhesive
Tremco Spectrem 1 adhesive is used to adhere silicone
seal to painted surfaces, as PSA adhesives will not bond to
most powder painted surfaces.
• Open blades. Use scraper to remove any existing seal or
adhesive.
• Cut seal to approximate length with release material still
on seal.
• Clean blade in the same manner as above. Temperature
limits also apply.
• Apply thin 1/8 in. bead of Tremco Spectrem 1 to blade
surface. Spread adhesive using a putty knife or scraper
to approximately ½ in. (13 mm) wide.
• Install seal to blade edge, starting at one end and
removing release paper as one moves down blade. Do
NOT stretch seal.
• Press seal firmly into place. If seal was stretched,
length will shrink.
• Allow adhesive material to cure 15 minutes. Trim seal
to length.
SS/Silicone Composite
Silicone rubber seal has a stainless steel clip to
mechanically fasten seal to the blade edge. Seal
material is cut-to-length before installing. Seal is
normally installed to the drive blade and to every blade
tip on the same side of damper.
Aluminum Airfoil Blades
Applicable to models: VCD-40, VCD-42, VCD-43,
SMD-401, ICD-45, HCD-140, HCD-240, HSD-401
Extruded aluminum blades have a groove at both blade
edges to hold seal. Blade ends are crimped to prevent
seal from sliding out.
• Open blades. Remove existing seal. It is usually
easiest to pull seal from blade end rather than pulling
it out of groove along blade edge.
• Cut seal slightly longer than blade length. Do NOT
stretch, as seal will creep back to original length.
• Start at one blade end. The non-attached seal
lip is installed away from the blade surface. Seal
can usually be stretched sufficiently to pass under
existing blade end crimp. Needle nose pliers works
well in grasping seal end.
• Use a center punch to re-crimp blade end if
necessary.
• Trim seal to length.
Blade Type
Elastomer
Material Blade
Attachment Blade Thickness Greenheck
Part number
Temperature °F (°C)
Minimum Maximum Minimum Maximum
3-V Vinyl Clip-on 16 ga. 14 ga. 455501 -20 180
Silicone Adhesive All All 457053 -60 400
SS/Silicone Clip-on 16 ga. 12 ga. 220108 -60 400
Fabricated
Airfoil Silicone PSA All All 464605 -60 350
Silicone Adhesive All All 457053 -60 400
EPDM PSA All All 468644 -20 250
SS/Silicone Clip-on 16 ga. 12 ga. 220108 -60 400
Aluminum
Airfoil Silicone Groove n/a n/a 461254 -60 400
EPDM Groove n/a n/a 460115 -20 250
Copyright © 2008 Greenheck Fan Corporation
Blade Seal Replacement Instructions
Rev. 2 Nov 2008
Blade Seal
Blade Seal