Specifications per the Prolon Terminal Box PL-TUB datasheet, doc 802-00028-009 (V9). Reviewed September 26, 2026.
The PL-TUB20 takes supply air in through its 20 in. round inlet and delivers it through a 24 x 22 in. rectangular discharge with a slip and drive duct connection. The Micromat insulation has its edges protected by a J-shaped metal trim to prevent air erosion.
Best For
- Variable air volume applications using a 20 in. nominal round inlet and 24 x 22 in. rectangular discharge, up to 3,000 CFM.
Warranty
Key Features
3,000 CFM Max Airflow
Rated for a maximum airflow of 3,000 CFM (1,416 L/s) at the 20 in. size.
Micromat Insulated
1/2 in. Micromat insulation in accordance with NFPA 90A/90B/255, ASTM E-84, SMACNA, UL 181/723 and CAN/ULC S102.
Rectangular Discharge
24 x 22 in. discharge with slip and drive duct connection.
Double Blade Damper
Damper in 22 ga. G90 galvanized steel with a polymer seal, on a 1/2 in. black zinc plated drive shaft.
Protected Liner Edges
A J-shaped metal trim protects the insulation edges to prevent air erosion.
G90 Galvanized Casing
22 ga. G90 galvanized steel casing with a 1 in. sleeve small end at the inlet.
ZOT Supply is an authorized distributor of Prolon products.
Technical Specifications
| Specification | Value |
|---|---|
| Model | PL-TUB20 |
| Series | Prolon PL-TUB terminal box |
| Nominal Size | 20 in. |
| Max Airflow | 3,000 CFM (1,416 L/s) |
| Pressure Loss | 0.13 inch WC (33 Pa) |
| Inlet Diameter (Dia D) | 19.875 in. |
| Discharge Width (Dim A) | 24 in. (609.6 mm) |
| Discharge Height (Dim B) | 22 in. (558.8 mm) |
| Weight | 37.2 lb (17 kg) |
| Casing | 22 ga. G90 galvanized steel casing |
| Damper | Double blade damper in 22 ga. G90 galvanized steel with polymer seal |
| Drive Shaft | 1/2 in. (12.7 mm) black zinc plated drive shaft |
| Insulation | 1/2 in. (12.7 mm) Micromat insulation in accordance with NFPA 90A/90B/255, ASTM E-84, SMACNA, UL 181/723 and CAN/ULC S102 |
| Insulation Edges | Protected by a J-shaped metal trim to prevent air erosion |
| Discharge | Rectangular discharge with slip and drive duct connection |
| Inlet Connection | Sleeve small end 1 in. for connection at inlet |
| Application | Variable air volume |
Documentation
Frequently Asked Questions
What is the maximum airflow of the Prolon PL-TUB20?
The PL-TUB20 is rated for a maximum airflow of 3,000 CFM (1,416 L/s), with a pressure loss of 0.13 inch WC (33 Pa).
What size is the discharge on the Prolon PL-TUB20?
The PL-TUB20 has a 24 x 22 in. (609.6 x 558.8 mm) rectangular discharge with a slip and drive duct connection, and a 20 in. round inlet with a Dia D of 19.875 in.
Is the PL-TUB20 insulated?
Yes. The PL-TUB20 is lined with 1/2 in. (12.7 mm) Micromat insulation in accordance with NFPA 90A/90B/255, ASTM E-84, SMACNA, UL 181/723 and CAN/ULC S102, with the insulation edges protected by a J-shaped metal trim.
Does the Prolon PL-TUB20 include a flow sensor?
No. The PL-TUB20 is supplied without a flow sensor. The same size is offered with the Prolon PL-FSD flow sensor as the PL-TUB20-FSD.
What is the PL-TUB20 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:
- 20 Inch
- Flow Sensor:
- Without Flow Sensor
