Fire Protection Air Compressor Guide

At C-Aire Compressors, we understand the critical role that fire protection air compressors play in ensuring the safety and efficiency of fire sprinkler systems. Our line of specifically engineered fire protection compressors caters to various applications, from whisper-quiet units ideal for noise-sensitive environments to heavy-duty options for maximum reliability. In this guide, we'll explore the different types of fire protection air compressors, how they work with dry pipe and pre-action sprinkler systems, and essential factors to consider when selecting the right compressor for your specific needs. C-Aire's fire protection air compressors are ETL Listed for Fire Protection to UL Standard 1450 & CSA Standard C22.2 No. 68 and have been specifically tested and certified for use in sprinkler systems when installed in accordance with NFPA 13, "Installation of Sprinkler Systems." Trust C-Aire for reliable, top-quality fire protection air compressors, backed by our commitment to exceptional performance and customer satisfaction.

Types of Fire Protection Air Compressors

Whisper Quiet Series (Light Duty)

Whisper quiet, compact units that are specifically designed for settings where noise is a concern. These units are oil-free, easy to install, low maintenance, and available in riser mount or tank mount configurations. New construction or tight systems with minimal air leaks are a good match for this series. Our tankless whisper-quiet units feature our Digital AMD Gen-3 with Leak Detection. Whisper Quiet Series units include a 1-year warranty.

S550M & S164R Fire Protection Air Compressors - C-Aire Compressors

Oil-Lubricated Tank Mount Series (Heavy & Standard Duty)

When reliability is essential, C-Aire recommends the Oil Lubricated Tank Series. Our Heavy Duty (HD) oil-lubricated compressors are built for longevity and provide the lowest total cost of ownership over the life of the building. In addition to new projects where the compressor will last for many years, the Oil Lubricated Tank Series is the perfect solution for replacing failed compressors in older systems. Our Standard Duty (SD) oil-lubricated compressors are dependable units, built at an economical price. The HD and SD Series include a 1-year unit warranty and a 3-year pump warranty.

S500M & S500H Fire Protection Air Compressor - C-Aire Compressors

Cold Storage Dry Air Series

FM Approved (R900 & R1700) regenerative drying air compressors specifically designed for dry pipe and pre-action sprinkler systems in freezer/refrigerated rooms and cold storage areas. The regenerative drying process (four molecular sieve towers) dries system air to a less than -40°F (-40°C) dewpoint, preventing the dangerous formation of ice plugs in cold storage systems and stopping the corrosion process.

R900 Dry Air Compressor - C-Aire Compressors

Baseplate & Portable Series

Tankless units that contain a motor, pump, and Digital AMD Gen-3. Our portable units are baseplate compressors fitted with pneumatic tires, a long handle, rubber feet, and a storage bracket for the handle. The baseplate and portable units feature our Digital AMD Gen-3 with Leak Detection. Baseplate and Portable units include a 1-year warranty and a 3-year pump warranty.

S600B & S244P Baseplate Fire Protection Air Compressor - C-Aire Compressors

Build A Fire Protection Compressor

How to Choose an Air Compressor for Fire Sprinkler Systems

When choosing an air compressor for a dry pipe, preaction, or deluge fire sprinkler system, it's important to select a unit that is appropriately configured and sized for your system. Here are some tips for selecting an air compressor for a fire sprinkler system.

HOW TO SIZE

NFPA 13 Requirements: According to NFPA 13, the air supply shall have a capacity capable of restoring normal air pressure in the system within 30 minutes (NFPA 13 8.2.6.3.2). Additionally, air compressors with a flow greater than 5.5 CFM at 10 PSI require a tank and a regulator-style air maintenance device with a bypass and restrictor (NFPA 13 8.2.6.6). NEW for the 2025 edition of NFPA 13: Where an air compressor is dedicated for the sprinkler system, the air compressor shall be listed for fire protection (NFPA 13 8.2.7.5.2).

Dry System Air Pressure (PSI): An air maintenance device regulates the supervisory air pressure in a fire sprinkler dry pipe system, preaction system, or dry pilot-actuated deluge system. The system air pressure shall be maintained as per the instruction sheet furnished with the dry pipe valve, or shall be 20 psi above the calculated trip pressure of the dry pipe valve, based on the highest normal water pressure of the system supply (NFPA 13 8.2.6.7.1). View our Dry Pipe & Preaction Valve Air Pressure Range Finder to determine the recommended air pressure range.

Single vs. Multi-Valve Systems: Single-valve dry sprinkler systems are compatible with all fire protection air compressors and require an air maintenance device or pressure switch (Digital AMD Gen-3) to control the system pressure. Multi-valve dry sprinkler systems are only compatible with tank-mounted air compressors and require an air maintenance device before each valve. For a more detailed breakdown, view our Best Practices diagram here.

Size of the Largest System (Gal): While there is technically no restriction on the number of systems one air compressor can serve, the typical recommendation is one air compressor per three systems. The largest system size will determine the number of gallons for which the air compressor needs to be rated (capacity rating). Each system is filled one at a time, and the 30-minute fill time requirement applies to each system separately.

Compressor Dry System Capacity Rating (Gal): The compressor's dry system capacity rating is determined by the flow rate (CFM) of the compressor and the system pressure (PSI). Note: Horsepower is not a reliable method for sizing a compressor for a fire sprinkler system because each manufacturer uses different components, which can cause the horsepower to vary at similar system capacity ratings.

Other Manufacturer Equivalent: If you are looking to replace an existing air compressor from another manufacturer, use our new Competitor Cross Reference Tool or contact our customer service team, which is here to help you find the properly sized C-Aire compressor alternative.

C-Aire Dry System Capacity Calculator: Enter your provided PSI (air pressure) and gallons to determine which compressor best suits your needs. This calculator helps you comply with NFPA 13 requirements by identifying air compressors capable of restoring normal air pressure in your dry pipe or preaction system within the required 30-minute timeframe. Simply input your system specifications, and the tool will recommend compatible C-Aire fire protection air compressors from our capacity ratings table, ensuring optimal performance for your fire sprinkler system. View the Dry System Capacity Calculator here.

OTHER FACTORS

Type of Environment: Settings such as nursing homes, churches, and apartment buildings may need an oil-free compressor to avoid noise disturbances during operation. Oil-free compressors (Light Duty Series) are a suitable choice for quiet settings and require minimal maintenance. For older systems or applications where noise is not a concern, oil-lubricated compressors (Heavy Duty Series) are recommended as they are built for longevity and provide the lowest total cost of ownership over the life of the building.

Electrical Requirements: Electrical issues are among the most common troubleshooting topics related to air compressors. The electrician should thoroughly understand the electrical configuration and requirements of the compressor and the incoming power supply before installation to avoid potential problems for fire protection contractors later on.

Quick-Opening Devices (Accelerators): For dry pipe valves equipped with an accelerator (quick-opening device), tank-mounted air compressors are strongly recommended as the tank provides a stable air supply buffer that prevents momentary pressure fluctuations from causing false trips of the accelerator.

Cold Storage Systems: Dry pipe systems are prone to corrosion, in part, due to moisture in the air produced by the air compressor. Regenerative drying air compressors (Dry Air Series) are specifically designed to prevent corrosion by drying system air to a dewpoint of less than -40°F, thereby preventing the formation of dangerous ice plugs in cold storage systems. Per NFPA 13, normal system air pressure in cold systems (spaces below 5°F) shall be permitted to be restored within 60 minutes, instead of 30 minutes (NFPA 13 8.2.6.3.2). C-Aire's Dry Air Series compressors (R900 & R1700) are FM Approved for use in dry pipe and refrigerated area sprinkler systems.

Maintenance: All air compressors require regular maintenance to ensure optimal performance. As mentioned above, oil-free compressors are low maintenance but do not last as long as oil-lubricated compressors. Having a proper maintenance plan for your air compressor is an essential part of any dry pipe fire sprinkler system. C-Aire has a Twin Cities-based service team with over 50 years of combined experience that will solve your service needs and help with your compressor maintenance.

In-Depth Guide to Fire Protection Air Compressors

This comprehensive guide provides valuable insights into the role of air compressors in two essential types of fire sprinkler systems: dry pipe fire sprinkler systems and pre-action fire sprinkler systems.

How Air Compressors Work With Dry Pipe Fire Sprinkler Systems

In a dry pipe fire sprinkler system, the pipes that carry water to the sprinkler heads are not filled with water until the system is activated. Dry pipe systems are typically used in areas where the pipes may be exposed to freezing temperatures, such as unheated warehouses or parking garages. In these situations, the water in the pipes could freeze and cause the pipes to burst if the system were filled with water all the time.

A fire protection air compressor is used to pressurize the pipes that carry water to the sprinkler heads. The air compressor is connected to the system through a network of pipes.

When a fire causes one or more sprinkler heads to activate, the air escapes, and the dry pipe valve releases. This allows water to enter the pipe and flow through the open sprinklers onto the fire.

The air compressor is an important part of the dry pipe fire sprinkler system because it provides the necessary pressure to hold the water back from entering the pipes. Without the air compressor, the sprinkler system would not be able to effectively suppress fires.

How Air Compressors Work With Pre-Action Fire Sprinkler Systems

A pre-action system is a type of fire sprinkler system that is designed to reduce the risk of accidental discharges. It is commonly used in areas where there is a risk of water damage, such as libraries, museums, or computer server rooms.

In a pre-action system, the sprinkler heads are not automatically activated when the system is pressurized. Instead, the system requires a separate signal, such as the detection of smoke, heat, or flame, before the sprinkler heads will open and release water. Unlike a dry pipe system, the pre-action valve controls the flow of water. The integrity of the pipe is also monitored by observing the air pressure in the piping. If there is a leak in the system, the air pressure will decrease and trigger an alarm, signifying a low air pressure situation.

When a fire is detected by a sprinkler head, the system will open an electronic pre-action valve to allow water to flow into the pipes. At this point, the system essentially becomes a wet pipe system. The activated fire sprinkler heads are opened to release water, leaving the other sprinkler heads in the system intact.

The air compressor is an important part of the pre-action fire sprinkler system because it provides the necessary pressure to hold the water back if the valve is inadvertently opened. Without the air compressor, the sprinkler system would not be able to effectively monitor leaks and protect against accidental detector operation.