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UL Listed NFPA 496 Type Y & Z Electrical Enclosure Purging and Pressurization Systems America's Best UL Listed NFPA 496 Type Y & Z Electrical Enclosure Purging & Pressurization Systems
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Best UL Listed Type Y & Z NFPA 496 Purging Systems

Type Y & Z
Pressurization Units

Model Number Matrix

The Model Number Segments below specify standard features and options for our Enclosure Pressurization Units.
Please note limitations to various selections apply as indicated by an asterisk and note number in red text.

Click question symbols below for more information on any particular item.

Typical Model Number:

1 - Unit Type Unit Type Details
Y Division 1 / Zone 1 to Division 2 / Zone 2
Z Division 2 / Zone 2 to Non-Hazardous
2 - Unit Series Unit Series Details

Class I Purge Unit - 2 CF Maximium
Class II Pressurization Unit - 10 CF Maximum
101B Class II Pressurization Unit - 50 CF Maximum
101C Class II Pressurization Unit - 250 CF Maximum
3 - Area Classification Area Classification Details
CI/CII Class I / Class II - Model 101A
CII Class II - Models 101B & 101C
4 - Presssure Switch Option *1 Presssure Switch Option Details
L Less Switch
W Class I, Group C & D / Class II, Group E, F & G Switch
B Class I, Group B, C & D Switch
5 - Mounting Configuration *2 Mounting Configuration Details
U Universal
V Vertical
H Horizontal
6 - Group B Swtich Voltage *3 Group B Swtich Voltage Details
24 24 VDC
120 120 VAC
240 240 VAC


1: Please select "L" for Universal Mounting Configuration.
    Please note Option "B" is available for Model 101A only..
2. Universal Mount Unit is suitable for Panel Mount Kit.
3. For Pressure Switch Option "B" only - please omit if not applicable.

Please consult a Best Purging Systems Corporation Sales Associate for more information and unit customization.

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Use our team-monitored email links below for swift and professional response to your needs...
You may also use the on-line product registration link below to obtain an extended warranty.

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Get full spectrum service from Best Purging for enclosure purging and pressurization solutions Product Registration Form

Best Purging Systems Corporation
Physical Address: 4725 Lawndale Street, La Marque, Texas 77568
Mailing Address:  P.O. Box 68 Hitchcock, Texas 77563
Phone: (844) 787-4348     |   Fax: (409) 935-5819
Office Hours:
 8 AM to 5 PM CST, Monday - Friday

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