---
product_id: 186963528
title: "M-Ke Thermaflex Flexible Hvac Duct - R4.2, 9\" Dia."
brand: "thermaflex"
price: "$431.55"
currency: USD
in_stock: true
category: "Miscellaneous"
url: https://www.desertcart.us/products/186963528-m-ke-thermaflex-flexible-hvac-duct-r4-2-9-dia
store_origin: US
region: United States of America
---

# M-Ke Thermaflex Flexible Hvac Duct - R4.2, 9" Dia.

**Brand:** thermaflex
**Price:** $431.55
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** M-Ke Thermaflex Flexible Hvac Duct - R4.2, 9" Dia. by thermaflex
- **How much does it cost?** $431.55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/186963528-m-ke-thermaflex-flexible-hvac-duct-r4-2-9-dia)

## Best For

- thermaflex enthusiasts

## Why This Product

- Trusted thermaflex brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

These highly efficient flex ducts feature a core that is bonded to the steel wire coil to support the fiberglass insulation. Duct insulation is available in three different R-values for varied thickness: R-4.2, R-6.0 and R-8.0 The acoustically rated, polyethylene inner liner on these HVAC ducts eliminates noise and easily expands Spiral ducts are mold and mildew resistant Temperature range is from -20F to 200F and -20F to 250F intermittent Inner core is self-extinguishing Ducts measure 4-20&quot; in diameter Greenguard certified 10 Year Limited Warranty..

## Images

![M-Ke Thermaflex Flexible Hvac Duct - R4.2, 9" Dia. - Image 1](https://images-na.ssl-images-amazon.com/images/I/31XgRHqSSBL.jpg)

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---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-11*