External Supply Plenums

Make-up air can be introduced several ways, including through the hood with an integrated supply plenum or an external supply plenum. External plenums positioned around the perimeter of exhaust only hoods are a great alternative to integral supply plenums. Unlike integral supply plenums, they do not sacrifice valuable hood containment area, can be retrofitted to almost any hood and are generally less expensive than integral plenums. Accurex offers four external supply choices - Air Curtain Supply Plenum (ASP). Horizontal Supply Plenum (HSP), Variable Supply Plenum (VSP), and Back Supply Plenum (BSP).

Standard construction features:

• Standard construction is with 18 gauge 430 stainless steel with embossed finish to match hood
• Perforated discharge panels (23% open)
• Supply plenums are available in lengths from 3 feet to 16 feet where additional lengths require hanging multiple plenums

Note: External supply plenums are shown on the hood, but must be ordered separately.

Quick Select Guide

Air Curtain Supply Plenum (ASP)

• Air Curtain supply plenums introduce the air near the hood to minimize mixing with air in the space
• A series of perforated panels evenly distribute air at lower discharge velocities which benefits hood capture and containment
• Easy and flexible installation
• Typically used in non-tempered or heat-only applications. Can be used as an efficient method for spot-cooling
• The ASP is available 14 or 24 inches wide by 10 inches high
• Mounted 14-20 inches above the bottom edge of the hood or flush with a drop ceiling
• External plenums can be placed on multiple sides of the hood to create a curtain of air on all exposed sides and increasing the volume of air brought in at the hood

Horizontal Supply Plenum (HSP)

• Make-up air is introduced horizontally through the face of the external supply plenum via perforated panels in a manner that does not interfere with the cooking operations beneath the hood(s)
• Perforated panels are located on the face of the external supply plenum to limit the throw to within several feet of the hood(s) and maintain laminar flow.
• Easy and flexible installation
• Typically used in tempered air applications since the air will mix with the air in the surrounding space
• The HSP is 12 inches wide by 18 inches high
• The HSP is typically mounted flush with the top of the hood

Variable Supply Plenums (VSP)

• Versatile plenum combining the features of the face and air curtain supply plenums.
• Make-up air is supplied horizontally through the face and vertically through the front perimeter via perforated panels in a manner that does not interfere with the cooking operations beneath the hood(s)
• Easy and flexible installation
• Manual damper is included in the plenum to modulate airflow between the face and air curtain allowing 0 to 50 percent through the air curtain and 50 to 100 percent through the face.
• Best suited for cooler climates where outside air can be used to cool the kitchen. Although either tempered or non-tempered air can be used depending on climate and comfort goals
• The VSP is 12 inches wide by 18 inches high.

Back Supply Plenums (BSP)

• An effective way to introduce make-up air into the kitchen is from the rear of the hood through a back supply plenum. A double layer of perforated panels allow for well distributed low velocity airflow at discharge behind and below the cooking battery.
• Back Supply Plenums also function as a backsplash panel and provide the proper clearance to limited combustibles needed in many installations to meet NFPA 96 standards.
• Typically used in non-tempered or marginally tempered applications, these plenums are also ideal for heating air during the colder months since hot air will rise from its low discharge position.
• This plenum directs air flow through perforated panels behind and below the cooking equipment without affecting capture and containment, cooking surface temperature, or pilot lights.
• When using non-tempered air, utilizing low air velocities will keep the air near the hood.
• These plenums are 6 inches deep and stretch the entire length of the hood and discharge at 31.25 inches above the finished floor.

Quick Select Guide