Description

• Projects in this scope area may include installing ventilation fans, electrical lines, and switches in common areas. The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities. 

Baseline

• Existing belt-driven rooftop fans should be replaced whenever possible with fans that use direct-drive motors (ECM motors for 300 to 2,000 cfm) and variable-speed control.  VariGreen type variable speed motors as supplied by Greenheck Company are recommended for exhaust fans. 
• Fan replacement should be concurrent with a clean-seal-and-balance scope of work on the ductwork, using techniques for sealing (aerosolized mastic, spot-spray mastic) ducts and balancing at each register (Constant Airflow Regulators, customized orifice plate) appropriate to the original construction materials. 
• Elevator machine room ventilation requires an intake louver and a thermostatically controlled exhaust fan with gravity damper sized for 45 air changes per hour. 
• Provide outdoor intake and exhaust with gravity dampers that close when the ventilation system is not operating. [COMPMOD] 
• Replace all rooftop fans with high-efficiency fans. Fans used to provide mechanical ventilation must meet or exceed the minimum system efficacies of the NYCECC. [COMPMOD]
• Incorporate passive supply ventilation via trickle vents in all windows. [COMPMOD]

Stretch

• Assume comprehensive air-sealing and unit compartmentalization. [COMPMOD]
• Balance mechanical ventilation (supply & exhaust) for all residential units, corridors, common areas, and in all community facilities. [COMPMOD]
• Upgrade mechanical ventilation systems for mold prevention. [SA]

RAD Conversions 

• Replace all rooftop fans with high-efficiency fans. Fans used to provide mechanical ventilation must meet or exceed the minimum system efficacies of the NYCECC.  
• Incorporate passive supply ventilation via trickle vents in all windows. 
• Provide 100% outdoor air supply (DOAS) in corridors and common areas (lobbies, etc.) in residential buildings.  
• Balance mechanical ventilation (supply & exhaust) for all residential units, corridors, common areas, and in all community facilities. 

Strategies

Optimize Performance, Operation & Maintenance of Buildings, Systems & Assets

Prioritize Sustainable Materials, Technologies & Practices

CompModRADSustainability AgendaCommercial BathroomsCommunity CentersCommercial Kitchens

Last Updated on January 10, 2026 at 2:03 pm

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Specifications

23 34 16 - Boiler Room Combustion Air Makeup and Ventilation System

23 37 23 - Roof Accessories

23 39 00 - Fans and Accessories