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Greenheck

Fans

Roof Mounted Fans

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Ceiling Exhaust Fans

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Performance Filter

Fan Type

Volume (CFM)

Static Pressure (in. wg)

Elevation (ft)

Elevation: 0 feet

Calculate Air Exchange (CFM)

Use the calculator to determine the Air Exchange (CFM) required to adequately ventilate an area.

Enter information into the fields below to calculate the required airflow per fan.

To calculate the CFM required to adequately ventilate an area, we divide the room volume by the appropriate “Minutes per Change” value.

[CFM] = [Room Volume] / [Min./Chg.]

* Room Volume (ft³)

Get help calculating room volume

Room Volume = Length:

X Width:

X Height:

* Minutes per Change (Min/change)

Get help calculating minutes per change

Area:

Minutes per change:

Range varies based on your selection

Your local building codes should contain information pertaining to the suggested air changes for proper ventilation. The ranges specified will adequately ventilate the corresponding areas in most cases. However, extreme conditions may require "Minutes per Change" outside of the specified range.

To determine the actual number needed within a range, consider the geographic location and average duty level of the area. For hot climates and heavier than normal area usage, select a lower number in the range to change the air more quickly. For moderate climates with lighter usage, select a higher number in the range.

* Number of Fans

Result

Airflow (CFM) per Fan

Starred items represent required fields.

Calculate Static Pressure (SP)

Use the calculator to determine the amount of static pressure the fan must overcome.

The pressure generated by fans in ductwork is typically very small. An accurate measurement of static presure is critical to proper fan selection however. Static pressure in fan systems is typically less than 2" SP, or 0.072 Psi.

The amount of static pressure that the fan must overcome depends on the air velocity in the ductwork, the number of duct turns (and other resistive elements), and the duct length. For properly designed systems with sufficient make-up air, the guidelines in the table below can be used for estimating static pressure.

* Total Pressure due to Ductwork

Get help calculating duct pressure

Ductwork:

Length of Duct:

Static Pressure:

(Refer to guidelines)

* Pressure from Fittings and other Elements

Get help calculating fittings pressure

Number of Fittings:

X 0.08"

Kitchen Hood Exhaust?:

Static Pressure from Kitchen Hood Exhaust:

(Refer to guidelines)

RESULTS

Static pressure

* Starred items represent required fields.

Static Pressure Guidelines

Non-Ducted 0.05" to 0.20"

Ducted 0.20" to 0.40" per 100 feet of duct (assuming duct air velocity falls within 1,000 to 1,800 feet per minute)

Fittings 0.08" per fitting (elbow, register, grill, damper, louver, duct turn, etc.)

Kitchen Hood Exhaust 0.625" to 1.50"

Important: Static pressure requirements are significantly affected by the amount of make-up air supplied to an area. Insufficient make-up air will increase static pressure and reduce the amount of air that will be exhausted. Remember, for each cubic foot of air exhausted, one cubic foot of air must be supplied.

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Construction Material Clear

Type of material a particular product is constructed out of.

Galvanized Steel

Motor Insulation Clear

The class of motor insulation for a given motor. The temperature capabilities of each insulation class is defined as being the maximum temperature at which the insulation can be operated to yield an average life of 2, hours (A = 15?C, B = 135?C, F =

Motor Phase Clear

Indicates the space relationships of windings and changing values of the recurring cycles of AC voltages and currents. The most common power supplies are either single- or three-phase.

Motor Type Clear

Describes the type of motor (i.e. Capacitor-Start, Split Phase, etc.)

Brushless DC
Shaded Pole
NEMA
PSC
BrushlessDC

Features Clear

Motion Sensor
Humidity Sensor
Light
EC Motor
ENERGY STAR® Rated
Whole House Speed Control

Shipping Type Clear

Freight
Parcel

Competitor Name Clear

Acme
Broan
Carnes
Cook
Dayton
Delta
Fantech
Greenheck
Panasonic
Soler and Palau

Competitor Model Clear

10C387
10C388
10C389
1AHA2
1AHA3
1AHB8
1AHB9
1AHD1
1AHD2
1MDE
1SDE
1UBH6
1UBH7
1UBH8
1WDB9
1WMC
20UD15
20UD16
20UD17
2RB86
2RB87
2RB88
2RB89
2VLD
36WG64
36WG65
36WG66
36WG67
3DPE2
3DPE3
3DPE4
3DPE5
3DPE6
3DPE7
3DPE9
3DPF1
3DPF2
3DPF3
3DPF4
3DPF5
3DPF6
5AE68
5AE69
5AE70
5AE71
5AE72
5AE73
5AE74
5AE75
5AE76
5AE77
5AE78
5AE79
5AE80
5AE81
5AV78
5AV79
5AV80
5AV81
5AV82
5AV84
5AV85
5TCK7
5TCK8
5TCL0
5TCL1
5TCL2
5TCL3
5TCL4
5TCL5
6CEV
6IEV
6WZN1
6WZN2
6WZN6
6WZN7
6WZN8
6WZN9
6WZP0
6WZP1
A50L
A70L
A80
A80HD
AE110
AE50
AE80
AE80B
AE80BL
BSQ
CLD
CLT
CSP
FV-0511VK1
FV-0511VKL1
FV-0511VQ1
FV-0511VQL1
FV-0811VF5
FV-0811VFL5
FV-1115VK1
FV-1115VQ1
FV-20VQ3
FV-30VQ3
FV-40QV4
GBR100
GBR80
GC
GN
HGB-T
ITG50
ITG80
ITG80H
QTXE080
QTXE110
QTXE110FLT
QTXE150
RB110
RB110L
RB80
SBE
SBP
SIG110
SIG80
SIG80-110
SP
SQ
SQIB
SQID
SQNB
SQND
VIBK
VIDK
XB
XB110
XB50
XB80
ZB110

Competitor Model Size Clear

005A
008A
010A
010A
015A
020A
025A
025A
030A
030A
06
070A
070A
08
090A
090A
10
10
10
10
100
100
100
100
1000
12
12
12
12
120
120
120
120
120
120
120
1221
126
128
135
135
135
140
140
146
148
15
15
15
150
150
150
150
150A
150A
160
160
165
165
165
165
166
18
18
18
18
180
180
180
1H24
1H30
1H36
1L24
1L30
1L36
200A
222
24
24
24
24
24
240
242
245
24D2
24EY
2L30
2L36
30
30
30E2
30FY
322
322
350C
36
36
36F2
36GY
522
522
542
60
622
7
70
720
740
80
80
80
800
822
842
85
90
90
90
90
90
90
95
A1050
A110
A125
A200
A200
A390
A510
A700
A780
A900
B110
B150
B70
B80
B90

Application Clear

Applications/uses for a particular fan or ventilator.

Exhaust Air
Exhaust General and Clean Air
Flat Roofs
High Wind
Recirculate Air
Supply Air
Exhaust Grease-Laden Air
Bathroom Exhaust

Base/Panel Length X Width Clear

Square base dimension on power roof ventilators. Square fan panel dimension on sidewall propeller fans.

13 x 13 in
15 1/4 x 16 1/4 in
15 x 15 in
17 x 17 in
18 x 18 in
19 3/4 x 18 1/4 in
19 x 19 in
20 x 20 in
22 x 22 in
24 1/4 x 22 in
24 x 24 in
25 1/4 x 24 in
26 1/4 x 26 1/4 in
26 x 26 in
30 x 30 in
32 x 32 in
34 1/2 x 34 1/2 in
34 x 34 in
38 x 38 in
40 x 40 in
42 x 42 in
44 x 44 in
56 x 56 in
57 1/2 x 57 1/2 in
58 x 58 in
72 x 72 in

Drive Type Clear

Transmission type of the ventilator (belt drive or direct drive).

Direct Drive
Belt Drive

Voltage Clear

The force that causes a current to flow in an electrical circuit. The voltage of a motor is usually determined by the supply to which it is attached. NEMA requires that motor be able to carry its rated horsepower at nameplate voltage plus or minus 1% al

115/208-230
208-230/460
115/230
115
120
208
230
277

HP Clear

The power required to drive an air moving device. Horsepower required varies with system conditions.

1
1 1/2
1/10
1/12
1/15
1/2
1/20
1/3
1/30
1/4
1/6
1/60
1/8
2
3
3/4
5

Inlet Width x Height Clear

Describes the size (width x height) of the opening where air is drawn into a ventilator.

11 7/8 x 11 7/8 in
11 7/8 x 7 5/8 in
12 7/8 x 10 in
13 1/4 x 10 5/8 in
13 7/8 x 13 7/8 in
15 7/8 x 15 7/8 in
16 7/8 x 13 1/4 in
19 7/8 x 19 7/8 in
22 5/8 x 10 1/2 in
22 5/8 x 13 1/4 in
22 7/8 x 22 7/8 in
23 7/8 x 23 7/8 in
34 7/8 x 34 7/8 in

Outlet Width x Height Clear

This dimension refers to the size of the discharge (where air leaves the ventilator) on a particular unit.

10 x 8 in
11 7/8 x 11 7/8 in
13 7/8 x 13 7/8 in
15 7/8 x 15 7/8 in
17 7/16 x 8 in
19 1/2 x 8 in
19 7/8 x 19 7/8 in
22 7/8 x 22 7/8 in
23 7/8 x 23 7/8 in
34 7/8 x 34 7/8 in
8 x 6 in
8 x 8 in

Mounting Position Clear

Refers to the orientation in which a product can be mounted.

Horizontal
Vertical

Damper Width x Damper Height Clear

The "ACTUAL" damper width and height. Dampers are undersized to allow them to be mounted into the duct work/wall opening.

10 1/2 x 11 1/2 in
10 x 10 in
12 x 12 in
14 1/2 x 14 1/2 in
14 x 14 in
16 x 16 in
18 1/4 x 18 1/4 in
18 x 18 in
19 1/2 x 17 1/4 in
20 x 20 in
22 x 22 in
23 x 23 in
24 x 24 in
26 x 26 in
30 x 30 in
32 x 32 in
34 x 34 in
35 x 35 in
38 x 38 in
50 x 50 in
8 x 8 in
9 1/2 x 6 3/4 in

Outlet Diameter Clear

This dimension describes the discharge diameter of a given product.

6 in

Thermal Protection Clear

This is a feature which protects the motor from overheating and thus prolongs service life of the machine. In the event that the motor approaches overheating the thermal protection cuts power and only returns it after a cooling period.