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Basic Adapter and Reducer Dimensional Information
Curbs without wood nailers = Adapted curb cap width and length will be 1/2‑inch larger than the curb AD dimension.
Curbs with wood nailers = Adapted curb cap width and length will be
11⁄2 inches larger than the curb AD dimensions.
Minimum adapted amount = 11⁄2 inches Maximum adapted amount = 10 inches
Adapter
(Fan curb cap is smaller than existing curb)
Reducer
Fan(Fan curb cap is larger than existing curb)
Curb Cap W & L |
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Curb Cap W & L - 1/2 in. | 2 1/2 in. |
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2 1/2 in. |
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Adapted Curb Cap W & L |
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AD |
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Curb
Models:
GPS, GPR, ATS
AD
B
Basic Curb Dimensional Information
Models:Models:
GPI, GPF, GPFV, ATI | GPE, GPEX, VCE, ISB, ATE | ||||||||||
AD |
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B | B |
Models:
ATR
AD 
B 
Model | Dimensions | |
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GPI, GPS, GPR, ATR, ATS, ATI | AD (actual) = 1½ inches less than unit curb cap | |
nominal wood nailer curbs | ||
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GPF, GPFV, GPEX, VCE, ISB, ATE | AD (actual) = 1 inch less than unit curb cap | |
nominal flanged curbs | ||
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GPS, GPR, ATS, ATR | B = AD Dimension + 8¼ inches | |
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GPI, ATI | B = AD Dimension + 4 inches | |
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GPF, GPFV | B = AD Dimension + 10 inches | |
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GPE, GPEX, VCE, ISB, ATE | B = Same as unit curb cap dimensions | |
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Note: AD is the actual width and length of the roof curb. Roof curbs are typically ordered using the nominal dimension which is equivalent to the unit curb cap dimension.
WOOD NAILER | FLANGED | |||||||||||
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| 1¾ |
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| 1¾ |
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GPIGPF
PITCHED |
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| TO ORDER PITCHED AND RIDGED CURBS |
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| RIDGED | The following information is required: | ||
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| 1. Specify pitched or ridged. |
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| 2. Include roof rise and run (see diagrams). This |
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| will be represented as a ratio (rise:run) with run |
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| always expressed as 12 units. Units of measure |
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| must be the same (inches, centimeters, etc.). |
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| HT | Example: The Pitch of a roof with a Rise of | |||
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| 3 inches and a Run of 12 inches equals a ratio |
Rise |
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| Rise | of 3:12. | |
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| 3. When specifying a rectangular curb, note | |||
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Run=12 |
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| whether the slope runs in the direction of the |
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| Run=12 | short side or the long side of the curb. | ||
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