Specifications per the Prolon Terminal Box PL-TUB datasheet, doc 802-00028-009 (V9) and the Prolon Flow Sensor (PL-FSD) datasheet REV 7.1.0 (PL-DATA-FSD-C/F-EN). Reviewed September 26, 2026.
The PL-TUB14-FSD takes supply air in through its 14 in. round inlet and delivers it through a 16 x 15 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. The PL-FSD flow sensor measures the dynamic pressure corresponding to air velocity through the box, and its 1/4 in. high and low pressure ports connect by tubing to the airflow sensor of a VAV zone controller.
Best For
- Variable air volume applications using a 14 in. nominal round inlet and 16 x 15 in. rectangular discharge, up to 1,600 CFM.
- Variable air volume applications using the PL-FSD sensor to measure velocity pressure through the measurement location.
Warranty
Key Features
1,600 CFM Max Airflow
Rated for a maximum airflow of 1,600 CFM (755 L/s) at the 14 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
16 x 15 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.
PL-FSD Flow Sensor
Four total pressure rods and two static pressure tubes feed a center core with 1/4 in. high and low pressure ports.
ZOT Supply is an authorized distributor of Prolon products.
Technical Specifications
| Specification | Value |
|---|---|
| Model | PL-TUB14-FSD |
| Series | Prolon PL-TUB terminal box |
| Nominal Size | 14 in. |
| Max Airflow | 1,600 CFM (755 L/s) |
| Inlet Diameter (Dia D) | 13.875 in. |
| Discharge Width (Dim A) | 16 in. (406.4 mm) |
| Discharge Height (Dim B) | 15 in. (381 mm) |
| 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 |
| Flow Sensor | Prolon PL-FSD |
| Flow Sensor Duct Diameter | 14 in. (356 mm) |
| Flow Sensor K Factor | 2.14 |
| Flow Sensor Construction | Four rods measure total pressure and two angular tubes measure static pressure, coupled to a center core with two chambers that centralize, amplify and balance the readings |
| Measurement Openings | Location and diameter of the measurement openings on each rod conform to Standard III of ASHRAE |
| Flow Sensor Material | Molded ABS plastic, pre-treated to meet the UL94 standard regarding flame spread in buildings |
| Pressure Ports | 1/4 in. high pressure port and 1/4 in. low pressure port |
| Application | Variable air volume |
Documentation
Frequently Asked Questions
What is the maximum airflow of the Prolon PL-TUB14-FSD?
The PL-TUB14-FSD is rated for a maximum airflow of 1,600 CFM (755 L/s).
What size is the discharge on the Prolon PL-TUB14-FSD?
The PL-TUB14-FSD has a 16 x 15 in. (406.4 x 381 mm) rectangular discharge with a slip and drive duct connection, and a 14 in. round inlet with a Dia D of 13.875 in.
Is the PL-TUB14-FSD insulated?
Yes. The PL-TUB14-FSD 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.
What is the K factor of the flow sensor on the PL-TUB14-FSD?
The PL-FSD flow sensor for a 14 in. duct diameter has a K factor of 2.14.
Where is the flow sensor K factor entered on a Prolon VAV controller?
In Prolon Focus software, duct setup takes the duct diameter in which the flow sensor is installed and the K factor of the flow sensor. Both are needed before running the Focus auto calibrate procedure.
How do I connect tubing to the PL-FSD on the PL-TUB14-FSD?
The PL-FSD has a 1/4 in. high pressure port and a 1/4 in. low pressure port. Run each to the matching high and low airflow inlet on the zone controller.
What is the PL-TUB14-FSD 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:
- 14 Inch
- Flow Sensor:
- With Flow Sensor
