Installation Instructions

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Document No. 546-00011

Rev. 2, October, 1999

Fume Hood Exhaust Terminal (FHET)

Page 1 of 5

Product Description

The Fume Hood Exhaust Terminal (FHET) is a one

piece flow control device used to vary the airflow

through an exhaust duct. The FHET can be provided

with either a pneumatic or an electronic damper

actuator. For pneumatic actuation, the FHET

consists of a duct section, blade damper, pneumatic

actuator, electric to pneumatic module, orifice plate

flow sensor, and a differential pressure transmitter.

For electronic actuation, the FHET consists of a duct

section, blade damper, electronic actuator, analog

output module, orifice plate flow sensor and

differential pressure transmitter.

Options

•

316 L Stainless Steel or Teflon

coated

•

Sizes 6”, 7”, 8”, 9”, 10”, 11”, 12”, 14”

•

Slip-Slip ends

•

Flange-Flange ends

•

Bellmount-Slip ends

•

Bellmouth-Flange ends

Slip-Slip Ends Flange-Flange Ends

Bellmouth-Slip Ends Bellmouth-Flange Ends

Figure 1. FHET End Configurations.

Product Numbers

Refer to the

Configuration and Sizing

section of the

Laboratory and Safety Solutions Technical Manual

(125-1930).

Required Tools

•

1/4-inch OD poly tubing (pneumatic

applications only)

•

Duct tape

•

Sealant

•

Small flat blade screwdriver

•

3/8-inch. open end wrench

•

Needle nose pliers

Prerequisites

•

Terminal ductwork is free of debris.

•

Ductwork is installed.

•

Airline installed (pneumatic applications

only).

Expected Installation Time

30 minutes

Instructions

These instructions are presented in three parts,

FHET Installation, Pneumatic Actuation and

Electronic Actuation and must be completed in the

order presented.

FHET Installation

Installation of the FHET in the exhaust duct or on a

fume hood.

Pneumatic Actuation

Provision of the 18-30 psi air supply.

Wiring the AO-P Module and Differential Pressure

Transmitter to the Fume Hood Controller Board.

Summary of content (5 pages)

PAGE 1
Installation Instructions Document No. 546-00011 Rev. 2, October, 1999 Fume Hood Exhaust Terminal (FHET) Product Numbers Product Description The Fume Hood Exhaust Terminal (FHET) is a one piece flow control device used to vary the airflow through an exhaust duct. The FHET can be provided with either a pneumatic or an electronic damper actuator.
PAGE 2
Document No. 546-00011 Installation Instructions Rev. 2, October, 1999 Electronic Actuation NOTE: Wiring the AO-E Module and differential pressure transmitter to the Fume Hood Controller. FHET Installation Installation of the FHET in the exhaust duct or on a fume hood. For installations other than the Bellmouth unit, which is mounted directly to the fume hood, the FHET must have at least 2 ½ duct diameters of straight rigid ductwork upstream of it (Figure 3).
PAGE 3
Document No. 546-00011 Installation Instructions Rev. 2, October, 1999 Table 1. LGH Slip and Flange Dimensions. Duct Size Length (L) Inches (mm) + 0.06 (1.5) Slip End Outside Diameter (O.D.) or Flange End Inside Diameter (I.D.) Inches (mm) Flange Bolt Hole Circle Size In. (mm) 6 16.00 (406.4) 5.88 (149.4) 7.375 (187.3) 7 16.00 (406.4) 6.88 (174.8) 8.5 (215.9) 8 16.00 (406.4) 7.88 (200.2) 9.5625 (242.9) 9 19.50 (495.3) 8.88 (225.6) 10.625 (269.9) 10 19.50 (495.3) 9.88 (251.0) 11.
PAGE 4
Document No. 546-00011 Installation Instructions Rev. 2, October, 1999 3. Connect a three conductor 20 AWG cable for the Lab AO-P Module through the wiring bushing/knockout. (Figure 6). If desired, the wiring bushing can be removed and a standard 1/2- inch conduit fitting may be installed in its place. See Figure 7 for the wiring connections to the Lab AO-P Module from the Fume Hood Controller Board. Figure 5. FHET Pneumatic Piping Connection.
PAGE 5
Document No. 546-00011 Installation Instructions Rev. 2, October, 1999 The Lab Controls Electronic Actuator Assemblies can be on the same power trunk as the FHC, LRC or on a separate transformer. Electronic Actuation Installation Wiring the AO-E Module and differential pressure transmitter to the Fume Hood Controller. AO- E MODULE The Electronic Actuator is provided with a pre-wired connector that is attached to the AO-E module on the J4 terminal.