Lambro Industries UL181 Aluminum Flexible Duct 4" x 25'

  • Item No M70026
  • Manufacturer LAMBRO INDUSTRIES
  • Mfr. Item No 414/UL
$31.72
  • Unit of Measure EA
Available: 27
In Stock
📦 On Order: 24 arriving Apr 25, 2026
Quantity:
  • Description
  • Additional Details
  • Purchase History
  • General Ledger Coding
Some product details generated with AI assistance — verify specs before ordering.

The Lambro Industries 414/UL is a high-performance, UL 181 Class 1 certified flexible air connector designed for low to medium pressure HVAC supply, return, and exhaust systems. Constructed from five layers of laminated aluminum and polyester, this 4-inch by 25-foot duct features a galvanized steel helix wire for superior structural integrity and collapse resistance. It is specifically engineered for bathroom fan ventilation and general exhaust applications, offering a maximum operating temperature of 250°F. Note that per UL guidelines, this duct should not be installed in lengths exceeding 14 feet and is not suitable for clothes dryer venting.

UL 181 class 1 certified marked and listed duct. Do not install in lengths greater than 14 feet. Maximum operating temperature of 257°F. Ideal for bath fan exhaust ventilation applications. Constructed with multiple layers of aluminum/polyester material. Galvanized helix wire construction for additional support. Flexible design for easier installation. Do not use for clothes dryer installations. Size - 4” x 25’

Lambro Dryer Transition Duct, Flexible, Laminated, 4 in Outside Diameter, 25 ft Length, Aluminum, UL Listed, For Applications where Rigid Metal Pipe is Not Required


Packaging/Shipping Size and Weight: Length: 5.625"  |  Width: 5.625"  |  Height: 15.5"  |  Weight: 2.38 lbs
Product Details
brand:Lambro Industries
type:Flexible Duct
material:Aluminum/Polyester Laminate
size:4" x 25'
certification:UL181 Class 1
Color:Silver
Finish:Metallic Aluminum
Material:Aluminum
Size:4" x 25'
Certification:UL 181 Class 1
Maximum Operating Temperature:250°F
Maximum Installation Length:14 feet
Construction:5-Layer Laminated Aluminum/Polyester
Support Type:Galvanized Helix Wire
Application:Bath Fan Exhaust, HVAC Supply/Return
Length:25
Standards:UL Listed
Type:Flexible, Laminated
Usage:For Applications where Rigid Metal Pipe is Not Required

Purchase History is only available to logged-in customers.

Log In Become a Customer

General Ledger Coding is only available to logged-in customers.

Log In Become a Customer

General Ledger Coding

General Ledger Coding is a value added service provided for you at no additional cost.

General Ledger Coding makes accounting easier by providing you with a calculated total of purchases based on your General Ledger Codes.

In addition to traditional General Ledger Summary provided at time of invoice, we can also provide quotes and order acknowledgements with General Ledger Coding as well. We also give you the ability to change a GL Code for one or all items for renovation projects that may utilize a single GL Code. We can also code any of our "extended inventory" items with your General Ledger Code at the time of quote, order confirmation and invoicing as well. We can code our item numbers directly to your GL Codes should our item categories not align directly with your GL Code Categories.

Please contact us if you wish to implement our General Ledger Coding feature.

Any and all prices are subject to change without notice. We will always bill you at current prices prevailing at the time of shipment (excluding backorders). Availability of product can change at any time. We receive products daily and the availability may not always reflect what is in stock.

GETTING STARTED

ASK ABOUT OUR
FREE SHIPPING and NEXT DAY DELIVERY!

GET IN TOUCH
X
Start Camera Scan your barcode Stop Camera
0 Cart