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Prolon PL-AV18 : VAV Round Damper, Diameter 18", Single blade, Air Flow CFM 2500, Velocity FPM 1415, Galvanized Steel Housing, Satin finish, No acoustic insulation

Prolon PL-AV18 : 18 in. Round VAV Terminal Box Damper, 2,500 CFM Max Airflow, Double Blade Damper, 22 ga G90 Galvanized Steel, 1/2 in. Drive Shaft, Factory Mounted Actuator Bracket

Prolon

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SKU:
PL-AV18
Condition:
New
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Nominal Size18 in. round
Max Airflow2,500 CFM (1180 L/s)
Pressure Loss0.09 inch WC (23 Pa)
Length20 in. (Dim P)
DamperDouble blade, polymer seal
Casing22 ga G90 galvanized
The Prolon PL-AV18 is a 18 in. round terminal box for variable air volume zoning, rated for a maximum airflow of 2,500 CFM (1180 L/s) with a pressure loss of 0.09 inch WC (23 Pa). It combines a 22 ga. G90 galvanized steel casing, a double blade damper with polymer seal, a 1/2 in. black zinc plated drive shaft and a factory mounted actuator bracket.

Specifications per the Prolon Terminal Box PL-AV datasheet, doc 802-00027-008 (V8). Reviewed September 26, 2026.

The PL-AV18 installs in the 18 in. round branch duct serving a zone. Its damper, driven through the 1/2 in. drive shaft, modulates the air delivered to the space, and the 1 in. sleeve small end at the inlet and discharge makes the duct connection.

Best For

  • Variable air volume zoning applications using a 18 in. nominal round terminal box, up to 2,500 CFM.
  • Installs that mount a damper actuator on a factory mounted actuator bracket.

Warranty

For warranty coverage on this Prolon item, contact ZOT Supply at sales@zotsupply.com or 855-825-2811.

Key Features

2,500 CFM Max Airflow

Rated for a maximum airflow of 2,500 CFM (1180 L/s) at the 18 in. size.

Double Blade Damper

Damper in 22 ga. G90 galvanized steel with a polymer seal.

G90 Galvanized Casing

22 ga. G90 galvanized steel casing, 20 in. long (Dim P).

Actuator Ready

Factory mounted actuator bracket and 1/2 in. black zinc plated drive shaft.

Slip Sleeve Ends

Sleeve small end 1 in. for connection at the inlet and discharge.

Authorized Distributor

ZOT Supply is an authorized distributor of Prolon products.

Technical Specifications

SpecificationValue
ModelPL-AV18
SeriesProlon PL-AV terminal box
Nominal Size18 in.
Max Airflow2,500 CFM (1180 L/s)
Pressure Loss0.09 inch WC (23 Pa)
Inlet Diameter (Dia D)17.875 in.
Length (Dim P)20 in. (508 mm)
Weight18 lb (8 kg)
Casing22 ga. G90 galvanized steel casing
DamperDouble blade damper in 22 ga. G90 galvanized steel with polymer seal
Drive Shaft1/2 in. black zinc plated drive shaft
Actuator MountingFactory mounted actuator bracket
Duct ConnectionSleeve small end 1 in. for connection at inlet and discharge
ApplicationVariable air volume zoning

Documentation

PDFTerminal Box PL-AV Datasheet, 802-00027-008 (V8)

Frequently Asked Questions

What is the maximum airflow of the Prolon PL-AV18?

The PL-AV18 is rated for a maximum airflow of 2,500 CFM (1180 L/s), with a pressure loss of 0.09 inch WC (23 Pa).

What are the dimensions of the Prolon PL-AV18?

The PL-AV18 is the 18 in. size, with an inlet diameter (Dia D) of 17.875 in. and a length (Dim P) of 20 in. (508 mm).

How does an actuator mount on the PL-AV18?

The PL-AV18 has a factory mounted actuator bracket and a 1/2 in. black zinc plated drive shaft.

Does the Prolon PL-AV18 include a flow sensor?

No. The PL-AV18 is supplied without a flow sensor. The same size is offered with the Prolon PL-FSD flow sensor as the PL-AV18-FSD.

What is the PL-AV18 made of?

The casing is 22 ga. G90 galvanized steel, and the double blade damper is 22 ga. G90 galvanized steel with a polymer seal.

Size:
18 Inch
Flow Sensor:
Without Flow Sensor
!