Buy Chimney Blocks in Custom Sizes - Fenestration Products

​Chimney Blocks

Call (800) 777-0202 or email us today to get a quote or request a sample of our Chimney Blocks.

Stop air from infiltrating your balance pocket and leaking around the sash
with chimney blocks from Frank Lowe!

Since 1955, Frank Lowe has been partnering with businesses across all markets to produce state-of-the-art industrial manufacturing solutions. We offer dedicated industrial contract manufacturing teams who specialize in providing comprehensive services to a variety of markets.From best-in-class materials, customizable products, and a full suite of industrial manufacturing services, we provide whatever it takes to help your business met its objectives. Regardless of the technical or logistics demands of your project, we will work with you every step of the way providing customizable distribution services and support to ensure the contract die cutting is completed and delivered on time, within budget, and to your exact specifications.

Our Chimney Blocks:

  • Stop air from infiltrating the balance pocket and leaking around the sash.
  • Reduce negative air pressure.
  • Reduce wind noise and condensation at the meeting rail
  • Available with single hole, dual-hole, off-center holes and no holes.
  • Used with block and tackle, spiral and constant force balance systems.
  • Available in custom sizes and can accommodate any window and balance combination.

In order to decrease air infiltration it is extremely important to follow these steps:

  • Position the chimney blocks on the balance for the lower (inner) sash. This prevents much of the outside air from entering through weep slots in the sill, traveling up the jamb pocket and coming through the interlock area and into the room.
  • They should be positioned about 2”-4” below the tilt latches for maximum benefit.

Give us a call today to get samples and a quote.

Chimney Blocks
Chimney Blocks

Are You Using Chimney Blocks For Your Product Application?