®
Gravity Ventilators
®
Document 483464
Model GRSI and GRSR
Gravity Ventilators
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
1
Designed for either supply or exhaust applications on natural gravity or positive
pressure systems. Often used in conjunction with other HVAC products
requiring an intake or exhaust vent. These units are low profile and have a rigid
aluminum, corrosion resistant design providing a strong, long lasting, efficient
and economical product. Integral birdscreen prevents entry of birds and other
small objects. Built in curb cap with prepunched holes for easy attachment to
roof curbs.
Optional built-in flashing flange (model GRSF) with prepunched holes for quick
and easy installations without a roof curb.
Receiving
Upon receiving the product, check to ensure all
items are accounted for by referencing the delivery
receipt or packing list. Inspect each crate or carton
for shipping damage before accepting delivery. Alert
the carrier of any damage detected. The customer will
make notation of damage (or shortage of items) on
the delivery receipt and all copies of the bill of lading
which is countersigned by the delivering carrier. If
damaged, immediately contact your representative. Any
physical damage to the unit after acceptance is not the
responsibility of the manufacturer.
Unpacking
Verify that all required parts and the correct quantity
of each item have been received. If any items are
missing, report shortages to your local representative to
arrange for obtaining missing parts. Sometimes it is not
possible that all items for the unit be shipped together
due to availability of transportation and truck space.
Confirmation of shipment(s) must be limited to only
items on the bill of lading.
Installation
Roof mount with a curb
1. Cut an appropriate sized hole in the roof surface.
Follow curb manufacturer’s installation instructions.
Caulk and flash curb to ensure a watertight seal.
2. Install optional backdraft damper. Secure damper
flange to curb damper tray.
3. Place ventilator on curb.
4. Secure ventilator to roof curb using a minimum of
eight fasteners.
5. Check all fasteners for tightness.
Roof mount with flashing flange
1. Cut an appropriate sized hole in the roof surface.
Caulk flashing flange to ensure a watertight seal.
2. Install optional backdraft damper. Secure damper to
duct work.
3. Place ventilator on roof.
4. Secure ventilator to roof using a minimum of eight
fasteners.
5. Check all fasteners for tightness.
Maintenance
Keep inlets and approaches to ventilator clean and free
from obstruction. Depending on the usage and severity
of the contaminated air, a regularly scheduled inspection
for cleaning the ventilator, and surrounding areas should
be established.
NOTE
Mount unit on a flat surface or mount to a roof curb.
