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3G Electric
QUIETFLEX Insulated Flexible Duct
QUIETFLEXInsulated Flexible Duct

QUIETFLEX Insulated Flexible Duct

The QUIETFLEX Insulated Flexible Duct (SKU 385, MPN 385) is a 3-inch diameter, 25-foot long fiberglass duct with a metallized polyester jacket. It features a fire rating of less than 25 seconds and a vapor…

SKU 3G-OTH-74495

Brand
QUIETFLEX
Item
Insulated Flexible Duct
Part Number
385
Category
Insulated Flexible Duct
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

QUIETFLEX
Manufacturer Part Number
385
Type
8, Fiberglass, Metallized Polyester
Lg
25 ft
Fire Rating
Less than 25 Seconds
Vapor Trans
0.05%

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QUIETFLEX Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The QUIETFLEX Insulated Flexible Duct (SKU 385, MPN 385) is a 3-inch diameter, 25-foot long fiberglass duct with a metallized polyester jacket. It features a fire rating of less than 25 seconds and a vapor transmission rate of 0.05%.

Frequently Asked Questions

What is the QUIETFLEX insulated flex duct used for?

The QUIETFLEX insulated flex duct is used for HVAC air distribution in residential and light commercial systems. Its fiberglass insulation and metallized polyester jacket reduce heat loss and control condensation, making it suitable for supply and return air applications where thermal efficiency and vapor control are required.

What are the specifications of the QUIETFLEX 385 insulated flex duct?

The QUIETFLEX 385 insulated flex duct has a 3-inch diameter, 25-foot length, and a fiberglass core with a metallized polyester jacket. It offers a fire rating of less than 25 seconds and a vapor transmission rate of 0.05%. The manufacturer part number is 385, and the SKU is 3G-OTH-74495.

Where to buy QUIETFLEX insulated flex duct worldwide?

3G Electric supplies QUIETFLEX insulated flex duct worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on the QUIETFLEX 385 (SKU 3G-OTH-74495) for your HVAC project.

How to install QUIETFLEX insulated flex duct?

Install QUIETFLEX insulated flex duct by cutting it to length with a sharp knife, then securing it to the HVAC plenum or register using metal clamps or zip ties. Ensure the vapor barrier is intact and avoid sharp bends to maintain airflow. Follow local building codes for fire-rated duct installation.

Used in

Common applications for QUIETFLEX
Commercial HVAC — QUIETFLEX insulated flexible duct for branch runs in ceiling plenums
Residential HVAC — 3-inch diameter QUIETFLEX duct for tight spaces between joists
Light industrial ventilation — QUIETFLEX Type 6 duct for low-pressure air distribution
Retrofit projects — QUIETFLEX 25-foot lengths for flexible routing around obstacles
Moisture-sensitive areas — QUIETFLEX duct with 0.05% vapor transmission rate for condensation control
Fire-rated assemblies — QUIETFLEX duct with less than 25-second fire rating for code compliance
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QUIETFLEX Products

3G Electric supplies QUIETFLEX insulated flexible duct. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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