Low Pressure Flexible Ducts (S-series)
Clevaflex Low Pressure Flexible Ducts are self supporting, easy to install and designed to improve airflow for a number of HVAC applications.
| Type S | Type SFV | Type SFA | |
|---|---|---|---|
| Construction: | One ply of corrugated aluminum with interlocked seams, folded flat and knurled for airtightness, strength and flexibility. | Type S core wrapped with fiberglass insulation and sleeved in a polyethylene vapor barrier. | Type S core wrapped with fiberglass insulation and sleeved in a fiberglass reinforced, metalized polyester vapor barrier. |
| Length: | 10' standard | 10' standard | 10' standard |
| Operating Temp: | 0 - 750°F | 10 - 200°F | 10 - 200°F |
| Velocity: | 5,000 FPM | 5,000 FPM | 5,000 FPM |
| Working Pressure: | 10" WC positive and negative | 10" WC positive and negative | 10" WC positive and negative |
| Burst Pressure: | 60" WC | 60" WC | 60" WC |
| 1-Ply Aluminum Core: | .0055" thick, AL 3003-H111 | .0055" thick, AL 3003-H111 | .0055" thick, AL 3003-H111 |
| Insulation: | N/A | 1-1/4" thick Std. | 1-1/4" thick Std. |
| R-Value: | N/A | 4.2 Std., 6.0 & 8.0 | 4.2 Std., 6.0 & 8.0 |
| Vapor Barrier: | N/A | 0.17 perms | 0.05 perms |
| ID Size | 3" | 4" | 5" | 6" | 7" | 8" | 9" | 10" | 12" | 14" | 16" | 18" |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weight oz/ft: Type S | 2.4 | 3 | 3.8 | 4.6 | 5.3 | 6.1 | 9.1 | 10.2 | 12 | 14.2 | 16.5 | 18.6 |
| Weight oz/ft: Type SFV, SFA | 4.3 | 5.1 | 6.2 | 7.4 | 8.2 | 9.6 | 13.6 | 15 | 17.4 | 20 | 22.9 | 25.8 |
| Crush Strength - lbs/ft | 50 | 50 | 50 | 45 | 45 | 40 | 50 | 50 | 45 | 40 | 40 | 40 |
| Span - Max Unsupported | 6' | 8' | 10' | 10' | 10' | 10' | 10' | 10' | 10' | 10' | 10' | 10' |
Note: ID sizes are nominal and weights are approximate
Type S
Type SFA
Type SFV
Codes:
- Clevaform Type S, Type SFV and Type SFA have been tested by Underwriters’ Laboratories to UL Standard 181 and are listed as Flexible Air Duct Connectors, Class 0 and Class1.
- Clevaform Type S, Type SFV and Type SFA meet the requirements of Bulletin 90A of the National Fire Protection Association for all diameters.
Applications:
- For main trunk and return lines
- Vertical takeoff from supply duct to single outlet in order to compensate for misalignment
- Connecting lines from mixing boxes in main trunk systems or directly from the plenum to room inlets or diffusers
- Connecting lines to under-window perimeter units
- Connector to combination light troffers
- Connector from the low-pressure side of attenuation boxes to diffusers
Performance Benefits:
- Improved Airflow – Maintains a constant cross-sectional area throughout a bend with pressure loss comparable to die-formed elbows
- Flexible and Easy to Install – Will not kink on 90-degree bends making it easy to use in tight areas
- Economical Installation – Easy to field-cut to desired length eliminating waste and reducing handling costs
- Self Supporting – Semi-rigid construction eliminates sag and droop between connection points providing a neat finished appearance
- Corrosion Resistance – All metal construction will not rust or rot, and is impervious to damage by mold or mildew
- Fire Resistant – All metal construction allows continuous operating temperatures from 200 degrees Fahrenheit
- Quiet – Corrugated construction reduces the transmission of mechanical vibration and noise
Suggested Specifications:
- Contractor shall furnish and install Clevaform S-Series Low Pressure Duct: Type S, Type SFV, or Type SFA as manufactured by Clevaflex in sizes and locations where indicated on drawings.
- Clevaform Type S shall be all-metal, semi-rigid construction, consisting of a single-ply aluminum strip, corrugated for strength and flexibility, with seams interlocked, folded flat and knurled for airtightness.
- Clevaform Type SFV shall consist of a Type S core and be wrapped with fiberglass insulation, and then sleeved in a polyethylene vapor barrier.
- Clevaform Type SFA shall consist of a Type S core and be wrapped with fiberglass insulation, and then sleeved in a fiberglass reinforced, metalized polyester vapor barrier.
- Duct connections to equipment and outlet collars shall be made in accordance with the manufacturer’s recommendations.
Note 1: Since installation of the materials and conditions of use are important factors in obtaining satisfactory results and are beyond our control, Clevaflex can make no warranties, expressed or implied, including warranties of merchantability and fitness for a particular purpose, with respect to the material or its use or performance. All consequential damages whatsoever are expressly excluded.
Note 2: The statements regarding the characteristics, properties and performance of the materials described herein are based on data believed reliable, but no guarantee of their accuracy is made and such statements should not be construed as warranties or as the basis therefore.