EXHAUST FAN FLOW METER
OVERVIEW AND MANUAL
THE ENERGY CONSERVATORY WARRANTY
EXPRESS LIMITED WARRANTY
Seller warrants that this product, under normal use and service as described in the operator’s manual, shall be free
from defects in workmanship and material for a period of 24 months, or such shorter length of time as may be specied
in the operator’s manual, from the date of shipment to the Customer.
LIMITATION OF WARRANTY AND LIABILITY
This limited warranty set forth above is subject to the following exclusions:
• With respect to any repair services rendered, Seller warrants that the parts repaired or replaced will be free from
defects in workmanship and material, under normal use, for a period of 90 days from the date of shipment to the
Purchaser.
• Seller does not provide any warranty on nished goods manufactured by others. Only the original manufacturer’s
warranty applies.
• Unless specically authorized in a separate writing, Seller makes no warranty with respect to, and shall have no
liability in connection with, any goods which are incorporated into other products or equipment by the Purchaser.
• All products returned under warranty shall be at the Purchaser’s risk of loss. The Purchaser is responsible for all
shipping charges to return the product to The Energy Conservatory. The Energy Conservatory will be responsible
for return standard ground shipping charges. The Customer may request and pay for the added cost of expedited
return shipping.
The foregoing warranty is in lieu of all other warranties and is subject to the conditions and limitations stated herein.
No other express or implied warranty IS PROVIDED, AND THE SELLER DISCLAIMS ANY IMPLIED WARRANTY OF
FITNESS for particular purpose or merchantability.
The exclusive remedy of the purchaser FOR ANY BREACH OF WARRANTY shall be the return of the product to the
factory or designated location for repair or replacement, or, at the option of The Energy Conservatory, refund of the
purchase price.
The Energy Conservatory’s maximum liability for any and all losses, injuries or damages (regardless of whether such
claims are based on contract, negligence, strict liability or other tort) shall be the purchase price paid for the products.
In no event shall the Seller be liable for any special, incidental or consequential damages. The Energy Conservatory
shall not be responsible for installation, dismantling, reassembly or reinstallation costs or charges. No action,
regardless of form, may be brought against the Seller more than one year after the cause of action has accrued.
The Customer is deemed to have accepted the terms of this Limitation of Warranty and Liability, which contains the
complete and exclusive limited warranty of the Seller. This Limitation of Warranty and Liability may not be amended or
modied, nor may any of its terms be waived except by a writing signed by an authorized representative of the Seller.
TO ARRANGE A REPAIR
Please call The Energy Conservatory at 612-827-1117 before sending any product back for repair or to inquire about
warranty coverage. All products returned for repair should include a return shipping address, name and phone number
of a contact person concerning this repair, and the purchase date of the equipment.
Kit components and parts of the Exhaust Fan Flow Meter
The Exhaust Fan Flow Meter kit includes
• Metering box
• Handle
• Overview booklet
Pressure tap
Velcro for handle
Snap pin position holes
Adjustable door
Overview
Short handle
Rubber gasket
Snap pin
Conversion chart
The Energy Conservatory’s (TEC) Exhaust Fan Flow Meter is designed to
make quick and accurate measurements of air ow through residential
exhaust fans. The effective air ow measurement range for the Exhaust Fan
Flow Meter is 10 to 124 cubic feet per minute (CFM). The device should be
used with a TEC pressure and ow gauge, such as the DG-1000.
During the measurement procedure, the Exhaust Fan Flow Meter is placed
directly over the exhaust fan grille and is pushed up against the wall or
ceiling so that the exible gasket on the end of the metering box creates an
air tight seal around the grill.
Overview continued
The pressure reading taken from the Exhaust Fan Flow Meter is easily converted to air ow in CFM using a ow table
attached to the side of the metering box. The DG-1000 and DG-700 digital pressure and ow gauges can also be set up to
display air ow readings directly in CFM.
The Exhaust Fan Flow Meter has three calibrated openings to provide an accurate measurement over the full range of the
device. A short handle is provided which can be attached to the metering box using Velcro strips. The handle is designed
to allow a standard painter’s pole or broom handle (not included) to be screwed into the open end of the handle to provide
access to exhaust fan grilles mounted high on walls, or on ceilings.
Connect tubing to the metering box
Connect one end of tubing to the pressure tap on the metering box (tubing is included with the
TEC pressure and ow gauge kit).
Connect tubing to the gauge
Connect the other end of the tubing to the T connector that is included with the TEC pressure
and ow gauge kit. Connect the two ends of the shorter tubing that is connected to the T
connector to the Channel A and Channel B input taps on the TEC gauge.
Set the door position on the metering box
The metering box comes with an adjustable opening which provides three ranges of
fan ow measurement.
The door position is determined by the position of the snap pin located on the top of
the metering box. The door position can be adjusted by pushing down on the snap
pin and sliding the door until the snap pin is in a new position hole.
Door Position Flow Range in CFM
E1 44 - 124
E2 21 - 59
E3 10 - 28
Attach the handle to the metering box
A short yellow handle is provided which can be attached to
the top of the metering box using the velcro strips. In addition,
a standard painters pole can be screwed into the end of the
yellow handle to make it easier to reach fan grills that are high
up on walls or on ceilings.
Snap pin position holes
Snap pin
Conducting the test
1. DG-1000: Turn on the DG-1000 gauge by pressing and holding the power button until the green light comes on.
DG-700: Power on the gauge by pressing the On/Off button.
DG-1000 power button
2. DG-1000: After the Home screen loads, touch Gauge to open the Gauge app.
3. DG-1000: Touch the mode area to open the Channel B Conguration menu.
Mode
1. DG-1000: Select Flow (CFM) from the Mode menu. Touch Device to open the Device menu and select Exhaust Fan
Flow Meter. Touch Conguration to open the Conguration menu and select which door position is being used. Touch
the arrow in the upper left of the screen to return to the Gauge app screen.
DG-700: Press the Mode button twice to put the gauge in PR/FL mode. Press the Device button until EXH appears in
the device section of the display. Press the Cong button until the setting on the gauge matches the door position on
the metering box.
Flow (CFM)
Exhaust Fan Flow Meter Door position
2. With the exhaust fan turned on, place the Exhaust Fan Flow Meter completely over the fan grill so that the exible
gasket on the end of the metering box creates an air tight seal around the grill. Hold the gauge steady for at least 10
seconds so that the gauge auto-zeros.
3. Acceptable metering box pressures
• When using the Exhaust Fan Flow Meter, the measured metering box pressure should never be greater than 8.0
Pa, and never lower than 1.0 Pa. Pressures above 8.0 Pa will commonly result in erroneous ow measurements
because the metering box will tend to restrict air ow through typical residential exhaust fans. Metering box
pressures below 1.0 Pa are too small to measure accurately.
4. Channel A pressure greater than 8.0
• If the Channel A pressure is above 8.0 Pa, rst check the door position. If the door position is set to E2 or E3,
adjust the position to create a larger opening in the metering box (e.g. E1 or E2). If the door position is set to
E1 (the largest opening) and the metering box pressure is still above 8.0 Pa, then the fan ow you are trying to
measure is outside the high range of the instrument (i.e. ow is greater than 124 CFM).
1. Channel A pressure less than 1.0 pascal
• If the Channel A pressure is below 1.0 Pa, rst check the door position. If the door position is set to E1 or E2,
adjust the position to create a smaller opening in the metering box (e.g. E2 or E3). If the door position is set to
E3 (the smallest opening) and the metering box pressure is still below 1.0 Pa, then the fan ow you are trying to
measure is outside the low range of the instrument (i.e. ow is less than 10 CFM).
2. Channel B will show the air ow reading from the exhaust fan. If the ow reading is uctuating, change the time
average setting on the gauge by touching TIME AVG.
Flow Conversion Table
Meter Pressure (PA) Flow (CFM)
E1 E2 E3
1.0 44 21 10
1.2 48 23 11
1.4 52 25 12
1.6 55 26 13
1.8 59 28 14
2.0 62 29 14
2.2 65 31 15
2.4 68 32 16
2.6 71 33 16
2.8 73 35 17
3.0 76 36 17
3.2 78 37 18
3.4 81 38 19
3.6 83 39 19
3.8 85 40 20
4.0 87 41 20
4.2 90 42 21
4.4 92 43 21
4.6 94 44 22
4.8 96 45 22
5.0 98 46 23
5.2 100 47 23
5.4 102 48 23
5.6 103 49 24
5.8 105 50 24
6.0 107 51 25
6.2 109 52 25
6.4 111 52 25
6.6 112 53 26
6.8 114 54 26
7.0 116 55 27
7.2 117 56 27
7.4 119 56 27
7.6 121 57 28
7.8 122 58 28
8.0 124 59 28
Calibration and Measurement Accuracy
CALIBRATION FORMULA
Door Opening Formula
0.5
0.5
0.5
E1 Flow (CFM) = 43.73 x (Metering box pressure in pascals)
E2 Flow (CFM) = 20.72 x (Metering box pressure in pascals)
E3 Flow (CFM) = 10.07 x (Metering box pressure in pascals)
FLOW ACCURACY
±10% of reading when used with a 1% accurate pressure gauge (such as a DG-700) with a display resolution of 0.1 Pa (0.0004
inches of water)
FLOW RANGE
Door position E1: 44 - 124 CFM
Door position E2: 21 - 59 CFM
Door position E3: 10 - 28 CFM
DIMENSIONS (INSIDE)
16 in. L x 13 in. W x 8 in. D
WEIGHT
3 lbs. including handle
Software Information
The Energy Conservatory (TEC) offers a variety of Windows-based programs. These programs can be found and downloaded
for free at software.energyconservatory.com.
TEC also offers driver support for the DG-500, DG-700 and DG-1000. The drivers are designed to work with Windows-
based computers with the following operating systems:
• Windows 7
• Windows 8
• Windows 8.1
• Windows 10
The drivers are available through Windows Update, and the DG-500 and DG-700 drivers can be downloaded from TEC at
software.energyconservatory.com.
TEC also offers mobile apps for Apple and Android devices that can be found in the Apple App Store or the Google Play
Store.
Instructional Videos
The Energy Conservatory (TEC) offers a variety of online instructional videos, including
™
• Minneapolis Blower Door
• Minneapolis Duct Blaster
Quick Guide
®
Quick Guide
• Field Calibration Checks for Gauges
• Pressure and Airow Basics
• Exhaust Fan Flow Meter
• TECLOG3
• TECTITE 4.0
• And many more
Visit www.YouTube.com/EnergyConservatory to see all of TEC’s instructional videos.
®
© 201 7 The Energ y Conser vatory
Upda ted July 2017, V1
2801 21st Avenue South
Suite 160
Minneapolis, Minnesota 55407
Phone: (612) 827-1117
Fax: (612) 827-1051
info@energyconservatory.com
energyconservatory.com
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