You have to use a UL-approved Stainless Steel Class "A" insulated chimney or a sound masonry chimney. Here are some of the ways you can install a chimney in your home. There are 2 basic ways to vent a wood-burning stove, (1) straight up and out the ceiling or (2) out the wall and along the side of the house.
Wood Stove Venting
Class A chimneys are made of a stainless steel interior and a stainless steel exterior, with either insulation or an air channel in between the outer and inner wall. You will use this when venting through a wall or the ceiling all the way to the roof or above the roof line.
Modern wood-burning stoves should be directly vented. Older style open-hearth fireplaces are not as effective nor as safe. Other options for secondary heat sources are non-electric pellet stoves and direct-vent non-electric gas heaters.
First of all, the chimney pipes should be positioned so that they are as vertical as possible. It is important to go through walls or partitions with 45° bends.
Is it better to vent range hood through the wall or roof? The best option for your range hood ventilation is to vent vertically through the roof since hot air rises. Vent through a side wall if you cannot vent directly above your hood.
The good news is that your plumbing vent can indeed be run horizontally. When figuring out how to lay the pipes within your walls, it's more important to remember the clearance that is required by your spill line (the point where water overflows a tub, sink, or toilet).
All stoves in homes built after 2008 require either an air vent or external air intake, regardless of heat output. Without it, the stove may struggle to draw sufficient air for clean, efficient burning. Even in older homes, a stove can benefit from an external air kit.
Vent pipes must be installed so they stay dry. This means that they should emerge from the top of the drainpipe, either straight vertically or at no less than a 45-degree angle from horizontal, so that water cannot back up into them.
The most effective form of flue system is a vertical, internal chimney however, you do have up to 4 bends or turns allowed within the system should you need to negotiate around an obstacle along the way in the form of 45° Elbows (never 90°) and a Roof Support should be used on the rafters as a final form of support.
Because of the nature of burning wood, which creates a considerable amount of smoke and requires an adequate draft to facilitate combustion, venting has to be done vertically through a chimney that rises above the roofline.
The NFPA recommends that a stovepipe be at least 18 inches from the nearest combustible material. Closer clearances are allowed in some situations (Table 1). Clearances through walls and ceilings. The NFPA does not permit a stovepipe to pass through any floor or ceiling or through any fire wall or fire partition.
Inside the house you will need to measure the single wall stove pipe. In a through the wall installation the single wall stove pipe must extend a minimum of 24" above the stove before making the 90 degree turn to go outside. This is to ensure the stove has a proper draft.
Using a fan to circulate heat
It's one of those immutable laws of the universe, but that doesn't mean you can't move it around. A fan sits on top of your wood burning stove and the heat from your stove will cause the fan to spin (no need to plug anything in!) and subsequently move the heat around the room.
Local building codes dictate the legal minimums for clearances to combustible materials like wood framing or panels. These mandated wood-burning stove air gaps are much more significant, usually 12 to 18 inches on the sides. Building codes don't regulate gaps for non-combustibles.
Insert a single flue through the wall and connect it to the bend. Make sure that the ceiling plate on the inside in already on the flue before you secure the clamps. Wrap the insulation blanket around the flue that is in your wall and make sure the flue pipe is level.
Explained, the chimney pipe must be a minimum of three feet above the roof but also two feet taller than anything within ten feet. The portion of the rule stating the pipe needs to be 2 feet above anything within 10 feet is where most people get confused.
Building Regulations recommend a minimum flue height of 4.5m however the chimney must be high enough to allow for enough draught to clear the exhaust gases.
Flue temperatures should range from 300-600°F (149-316°C) for efficient combustion. Firebox temperatures can reach 800-1200°F (427-649°C) or higher, depending on the stove's design and fuel quality.
This flue passes through the external wall and then runs up the side of your house. The angle of the twin wall flue as it passes through the external wall will be at a 450 angle. There will be a wall sleeve encompassing the flue as it passes through the wall cavity.
Vent pipes that release sewer gases and maintain proper water pressure may incorporate bends or 90 degree elbows to navigate obstacles and connect to fixtures like sinks.
Vent and branch vent pipes shall be free from drops and sags and be sloped and connected so as to drain by gravity to the drainage system. Every vent shall rise vertically to a minimum of 6 inches above the flood level of the rim of the fixture being served.
A straight, short duct run with limited elbows and transitions will allow the hood or downdraft to work most efficiently.
Venting a Chimney Straight up through the ceiling is the quickest route to vent your stove and maybe the least expensive. Once you vent your stove pipe up to the ceiling box, you need to start using a triple wall pipe to finish the chimney. The triple wall pipe is designed for wood stoves.
It is highly inadvisable to use a fire without a baffle in place. It can cause irreparable damage.
Never use PVC pipe, gas vent pipe, dryer vent pipe or single wall black stove pipe to vent your pellet stove.