Twin City IM-4700 User Manual

Gravity Relief/Intake Ventilators

INSTALLATION, OPERATION & MAINTENANCE MANUAL

Models

GRV, TEL, TIL, LUG

IM-4700

June 2014

Model GRV

Model LUG

Twin City Fan & Blower Catalog 4720 provides additional information on this equipment. This catalog can be found
at www.tcf.com or by contacting your local Twin City Fan & Blower sales representative.

Models TEL & TIL

Nomenclature

GRV – 120 B

GRV = Gravity Relief/Intake Ventilator Design Vintage (GRV)
TEL = Exhaust Louvered
TIL = Intake Louvered Throat Dimension (TEL/TIL)
LUG = Low Profile Upblast Gravity Exhaust Vent Size (LUG)
Nominal Throat Diameter (GRV)
090 = 9.00" 270 = 27.38"
120 = 12.13" 300 = 30.38"
160 = 16.25" 320 = 32.38"
180 = 18.25" 360 = 36.38"
210 = 21.25" 420 = 42.38"
240 = 24.25" 480 = 48.38"

©2014 Twin City Fan Companies, Ltd.

Receiving, Inspection & Unpacking

When the equipment is received all items should be
carefully checked against the bill of lading to be sure all
crates and cartons have been received. Before accept­ing delivery, carefully inspect each carton or crate for
visible shipping damage. If any damage is noticed, the
carrier should make the proper notation on the delivery
receipt acknowledging the damage. Make notations of all
damage on all copies of the bill of lading and have all
copies countersigned by the delivering carrier. The car­rier should also fill out a Carrier Inspection Report. The
factory Traffic Department should then be contacted.

General Installation

CAUTION: Sheet metal parts, screws, clips and similar
items inherently have sharp edges, and it is necessary
that the installer and service personnel exercise caution.

The installation of this equipment shall be in accordance
with the regulations of authorities having jurisdiction and
all applicable codes.

File claim for damage with the carrier. Physical damage
to the unit after acceptance is not the responsibility of
Twin City Fan Companies, Ltd.

Unpack each carton or crate and verify that all required
parts and proper quantities of each item have been
received. Refer to drawings for part descriptions. Report
shortages or missing items to your local representative
to arrange for replacement parts

Due to availability of carriers and truck space, it is not
possible to guarantee that all items will be shipped
together. Verification of shipments must be limited to
only those items on the bill of lading.

This equipment is to be installed by an experienced
installation company and fully trained personnel.

The mechanical installation of the exhaust ventilator
consists of making final connections between the unit,
building services, and duct connections.

Service Clearance

Adequate clearance around the unit should be kept for
safety, maintenance, and proper unit operation.

A minimum clearance of 36" to 48" is recommended
to insure proper ventilation. Unit should be installed
remote from building air exhausters to inhibit ingestion
of exhaust air into building.

Allow a minimum of 24" clearance above the unit for
removal of unit top cover. Note: Clearance may have to
be increased if using the hinged curb option.

The unit must not be installed under any obstructions.

Unit Installation

General

1. The unit should be roof mounted only to an appro­priately sized roof curb or duct. See "Roof Curb
Installation" on page 3.

2. The base of the curb cap should be horizontal.

Figure 1. Service Clearances

24"

36"

Model GRV shown

Installation

1. Drill 8 holes (2 per side) into the roof curb through
the holes provided in the unit curb cap.

2. Bolt the unit to the roof curb through these holes

1

⁄4-20 self-tapping screws.

using

2 Twin City Fan IM 4700