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NFPA |
National Fire Protection Association |
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NH |
No Heat |
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NH |
Nil Height |
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NH |
No Hall |
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NHS |
Nice Homely Surroundings |
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NID |
National Institute of Design |
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NPS |
Nominal Pipe Size |
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NPSM |
National Pipe Straight Mechanical thread |
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NRE |
Non-Recurring Engineering |
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NRRR |
Non-Residential Remodeling and Renovation |
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NRV |
Non Return Valve |
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NSF |
Net Square Footage |
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NSPE |
National Society of Professional Engineers |
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NTS |
Not To Scale |
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OAH |
Overall Height |
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OBC |
Ontario Building Code |
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OC |
On Center |
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OD |
Outside Dimension |
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ODAT |
Ohio Design Assistance Team |
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OFCH |
Oil-Fired Central Heating |
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OFL |
Over-FLow alarm |
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OGSF |
Outside Gross Square Footage |
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OGSF |
Overall Gross Square Feet |
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OJ |
Outer Join |
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OT |
Overflow Threshold |
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