Z-flex ZF-2SVWT03 Z-vent 3 Inch Adjustable Wall Thimble

Product Description

The Z-FLEX ZF-2SVWT03 is a single-wall adjustable wall thimble designed for use with Z-Vent AL29-4C special gas vent pipe systems. It adjusts from 4 inches to 7 inches in depth to accommodate varying wall thicknesses, fitting a 3-inch diameter vent pipe. Fabricated for positive and negative pressure applications, this thimble is tested and listed to UL1738 and S636 standards. It is approved for Category II, III, and IV venting, making it suitable for high-efficiency and condensing appliance installations. HVAC and mechanical contractors install this component when routing a vent through an exterior wall.

This wall thimble is used in residential and light commercial installations where a Z-Vent single-wall vent pipe exits through a framed wall assembly. The adjustable depth range makes it practical across standard 2x4 and 2x6 wall construction as well as walls with additional insulation or cladding. It is rated for the demanding flue conditions produced by Category II, III, and IV appliances such as high-efficiency gas furnaces, boilers, and water heaters. The Z-Vent system it supports is engineered AL29-4C stainless steel vent pipe built for condensing flue gas environments.

Key Features

• Adjustable depth from 4 inches to 7 inches to fit varying wall thicknesses
• 3-inch diameter, compatible with Z-Vent single-wall vent pipe
• AL29-4C special gas vent construction for corrosion resistance in condensing applications
• UL tested and listed to UL1738 and S636
• Approved for CAT II, III, and IV venting applications
• Supports both positive and negative pressure venting systems

Compatibility

Designed for use with the Z-FLEX Z-Vent single-wall AL29-4C special gas vent pipe system in 3-inch diameter configurations.

Installation Notes

Installation should be performed by a licensed HVAC or mechanical contractor in accordance with the appliance manufacturer instructions and applicable local mechanical codes. Power down or shut off gas supply to the appliance before beginning any vent work. Ensure the wall opening is sized and framed correctly before setting the thimble depth, and verify the final assembly maintains all required clearances to combustibles per the vent system listing.

Technical Specifications

• Diameter: 3 inches
• Adjustable Depth Range: 4 inches to 7 inches
• Venting Type: Single Wall
• Vent Series: Z-Vent
• Material: AL29-4C Stainless Steel
• Pressure Rating: Positive and Negative Pressure
• Venting Categories: CAT II, CAT III, CAT IV
• Listing: UL1738 / S636
• Weight: 1 pound

Standard Information

• Brand: Z-FLEX
• Manufacturer Part Number: ZF-2SVWT03