Open Fireplace Flue Design

In most situations the area of the fireplace opening is controlled by considerations other than the performance of the system such as aesthetics.

Open fireplace flue design.

This is a diy outdoor fireplace built using our plans without a chimney flue. The design of residential fireplace chimneys is directly related to. The rear wall of the firebox rises vertically from the floor of the fireplace and then begins to slant towards the fireplace opening just at the top of the gas logs. To provide adequate draft and safe venting of combustion products the chimney flue for a fireplace has to be adequate in size or cross sectional area.

Standard built in fireplaces sometimes require use of a long metal pole with a hooked end that you use to reach into the chimney and manually pull down the lever of the damper doors to open the flue. The use of a chimney flue is not wrong at all but we know they aren t necessary if the structure is built the way we build. Fire below to provide a clear passage into the flue. Generally the damper opening must be 90 of the flue size.

Smoke and gases. If it not symmetrical the fire will burn unevenly due to an all round the clear cross sectional area will. This article series provides information about masonry fireplaces. Fireplace flue size specifications relation of fireplace size to flue opening dimensions table of required chimney flue size and flue dimensions for masonry fireplaces.

If the existing damper doesn t fully open or if the design originally was too small the damper opening must be increased to solve the smoking problem. Design of clay masonry for sound insulation design of clay masonry for sound insulation. Open fireplace design and construction. Adjusting the damper allows you to burn a fire efficiently and safely.

Properly a fireplace needs pleasing proportions and an appropriate relation of fireplace area flue size and chimney height. Straying too far from accepted practices may result in a fireplace that burns poorly or fails to conform to building. It is also important to have an adequate damper opening size to allow smoke to easily pass from the fireplace area into the flue area. Lead approximately 1 8 mm thick.

The firebox design is critical. Stainless steel and cast iron flue dampers commonly are opened with a touch button control system. 1 the area of the fireplace opening 2 the area of the flue liner and 3 the height of the chimney. This is not to say that you absolutely can t use a chimney flue with our designs we just know that they aren t always necessary.

Though designs vary many common patterns have emerged through experience with successful fireplaces. Here is a photo of a new masonry firebox in my own home.