Gas installation manual vent

Mikeq, Yes, Mike, but I can't safely give absolutely-correct clearance distance figures; instead you will want to check the installation manual for the specific heating products you're installing, as they differ a bit among manufacturers, heaters, vents.

Would like to know if there are terminal clearances needed for a concentric direct vent of a cat 4 furnace with a water heater b-vent terminal nearby?

John Thank you for the helpful question. You're right that some Canadian direct vent clearance distances had crept into the U. I have corrected the data in the clearance distances for direct vents and have added more details, tables, codes. Don't hesitate to ask further questions as needed. Your careful reading has helped me make the side wall vent distance tables accurate and so will help other readers.

You may need to clear or refresh your browser cache to see the updated page. We welcome your further photos, comments, questions. I want to put an atmospheric vented 40 gallon gas water heater in the utility room on the main floor of a 2 story house. It will be located against an outside wall.

Double wall Type B vent pipe will run 2 feet vertical from the draft hood into a 90 degree elbow. Then 16 inch horizontal through a wall thimble and into another 90 degree elbow. Then 15 feet vertical up the outside of the house through the eve terminating 2 feet above the highest part of the roof within 12 feet. My question is: Can I leave the B vent going up the outside of the house in the open or does it have to be enclosed in a chase?

Rural Oregon location. Most likely yes. You will see in the installation manual for a typical direct vent gas fireplace that the vent like this quite short and run horizontally out through a wall. There are some models that will allow vertical venting option however. So what we need to do is select a model that you like and look at the specifications and the installation manual. I want to convert my wood fireplace to a direct vent gas unit running the vent pipes up my existing chimney. Is that too tall to do this?

Alex I agree that you don't want to modify a gas vent - you might make it unsafe. Where I've seen this obstruction before, the deck builder usually frames a rectangle around the vent to keep the deck framing away from the vent. So if it's a joist that's giving you clearance trouble, you'd just cut that joist short and carry it with a header framed between the two joists on either side of the short one.

Hello I been reading your site up and down. My question is about deck installation. I have direct gas vents on the back of my house.

However they were installed about the height where the deck support beams would go. Can I install the deck next to the side of it? Is this considered an inside corner issue, which means I need 3 feet clearance from the side of the deck? I prefer to install on top of it, but then the vent would be within 1 foot below the deck.

I also did not see a option in your guide for modifying the vent to point down. Joe Thanks that's an interesting question; In my mere opinion, as the concern is total distance from point of exit of the building to the air inlet, and as the purpose is safety, I'd measure from the closest point on the vent termination cover to the closest point on the air inlet.

The final authority is your local building inspector;. The NFGC Recommended Clearance Distance Table for a Direct Vent Gas Appliance shows a requirement K for "Distance to a mechanical systems air supply inlet as 6 feet and 3 feet above if within 10 feet horizontally" My outside air supply inlet has a hard plastic cover which only allows fresh air in thru a horizontal entry port below the main house inlet vent.

This horizontal plastic entry port is 5" deep covering the main house inlet vent. Am I able to include this 5" with 31" for the total vertical separation of 3 feet to the bottom edge of the direct vent heater port? Does this apply to an inside the house mechanical systems air supply exhaust inlet which is part of an Energy Recovery Ventilator System ERV? This ERV inside the house air supply exhaust inlet draws inside air into a heat exchanger and expels the air to the outside of the house.

Fresh air is brought into the heat exchanger from an outside air inlet and passes thru the heat exchanger and is forced out vents inside the house. I would believe that the answer is that this inside the house exhaust air supply is not addressed by the above rule.. Anthony Thank you for the questions. Gas heater vent clearances are given above on this page; and of course the IO manual for your specific tankless water heater brand and model will have specific clearances that the manufacturer has determined must be respected for that very heater - those may differ from what we show here.

There is no direct vent gas fired heater that I would vent up 24 feet. None of the vents discussed here run that distance. I am considering venting a tankless water heater through the sidewall from garage , what is the distance the opening needs to terminate from eaves , its on 1st story of 2 story house.

The Location of Tankless is in the Garage. On - by mod - sources for clearance distance to or requirement for sealed soffits over a direct vent for a gas heating appliance. Thank you for taking the time to write about this direct vent clearance question, John. Obviously I didn't make any of this up, though sometimes I may quote standards that are later modified. Bottom line: you're right that there are few model building code citations about clearance distance from gas heating appliance direct vent termination and a building soffit.

That requirement is supported by some code documents, some training materials, and some manufacturers' installation instructions - thus becoming "code" by inclusion. Below the gas vent clearance tables on this page we cite the sources of data appearing in the table. This distance requirement may vary in order to be in accordance with local building codes, the gas supplier, and the equipment manufacturer's own product installation specification Clearance must be in accordance with local installation codes and the requirements of the gas supplier 3.

Continuing Discussion: John Watch out : The safety concern here is that installers of direct vent systems on gas heating equipment should OPINION take care to assure that gas combustion products do not re-enter the building where in addition to condensation and moisture damage the most-serious concern is the risk of fatal carbon monoxide poisoning. Particularly on homes whose roof overhang or eaves include a vented soffit, but even on un-vented or "closed" soffits there is a risk of combustion gases leaking into the building roof space or attic or in some constructions, an occupied top floor of the building.

Code writers can't predict every possible construction configuration nor every mistake I alone have made in 50 years of construction work, inspection, and repair; so they try to write in terms of objectives. Then, manufacturers of heating equipment are among those particularly concerned that their equipment should be installed in the safest possible manner.

For that reason code writers also typically include a provision that equipment So in effect even if a requirement for protection a soffit from exhaust gases appeared ONLY in manufacturers' literature, it's included in and is "code" by that requirement. The illustration below showing a minimum of 12" clearance of gas vent to roof overhang is from ICP's gas furnace installation instructions, not-accidentally included in the employee training materials for some gas companies such as Questar our source.

As another example also cited in our references to the table from CSA as incorporated by BC British Columbia Housing, we have at the very least a mould and moisture concern: " If there are vented soffits above a sidewall vent, the soffit vents should be sealed for 6 feet on either side of the vent.

Draw a vertical line above the vent and measure 6 feet on either side of that line. If the roof space is to be vented, ensure that there is adequate venting overall in other portions of the attic. There have been reports of moisture and mould on the underside of roof sheathing in houses with sidewall vented appliances and also on adjoining houses. Similar problems have been observed in older homes that have been retrofitted with new high efficiency gas furnaces where the venting has been put through the wall rather than keeping it through the roof.

Here's an example of the "install as per the manufacturer" citation I mentioned, from the California Code Chapter 8: Chimneys and Vents. Listed direct-vent appliances shall be installed in accordance with the manufacturer's installation instructions and Section Vent terminals that terminate through an outside wall of a building and discharge flue gases perpendicular to the adjacent wall shall be located not less than 10 feet mm horizontally from an operable opening in an adjacent building.

Exception: This shall not apply to vent terminals that are 2 feet mm or more above or 25 feet mm or more below operable openings. A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Section Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Apologies for the delay. Just ask us! Search the InspectApedia website. Comment Form is loading comments Side wall venting saves costly materials and labor on two, three or more story runs.

It also increases living space by cutting out interior chases. Proven safety interlocks assure proper exhaust, a feature conventional chimneys do not offer in today's homes and buildings. Factory wired safety and operating controls allow simple interlock with any burner. SS2 features a self-cleaning stainless steel, backward inclined impeller and sealed ball bearing motor for virtually maintenance free installations. Tjernlund Corporation also provides a Sidewall Venting sizing tool for oil fired heating equipment www.

Catalog XHO Reprinted Bradford White Corporation, U. Stove with snorkel horizontal termination. Most kitchen stoves have ranged hoods over them to direct gas outside. Install the slip connector or telescoping section last. To find the minimum cfm for your vent hood over a gas stove, divide the total btus by Hht installing a direct vent gas fireplace direct vent. Generally, venting to the outdoors is not required unless the range contains special features such as a cooktop grill or other unit that smokes or otherwise requires additional safety measures.

Gas fireplace and stove buying guide direct vent gas. Proper installation of the range to the gas line is recommended in manufacturers' instruction manuals. This will get the air circulating, and by the time you turn on the stove, all the gas and fumes will move out quickly.

Most units come as freestanding units with their own standing legs. The more btus your gas stove has, the more important it is for you to duct your hood to the outside. The indoor air is heated by radiant heat from the unit itself and can be improved with the use of a blower.

The lower part of the vent flange, however, will sit on top of the shingles. Can work with all cooking configurations. You may have to make a hole in the wall for the gas hose as it's illegal to keep gas containers indoors. Start with the rigid sections and work from the stove to the wall.

Yes, gas ranges produce a lot of heat and small concentrations of harmful chemicals. Try to keep it close to the fan location. Below are illustrations of some typical direct vent chimney installations. But, sometimes you will need more. Use a pencil or marker to connect the dots between the locater holes to outline the vent hole.

If you don't have that clearance, sometimes removal of the sill plate may give you the extra room. We recommend at least cfm for a vent hood over a gas stove. Installation of the stove pipe is the same as for vertical installation. The direct vent gas stove is typically more efficient than a b vent meaning it will return more of the heat generated back into the home. Outdoor air is drawn into the firebox, pushing the hot air for venting out.

While most people use an insert setup for the direct vent there are some who will use it with a freestanding gas unit. Ventilation is one of the most important things to consider with your gas stove.

This means that no renovation of the premises is required. How to install a direct vent pipe. You need 3 of clearance to combustibles above the horizontal run. Installing a vent hood on the roof start in the attic and drill a hole through the roof in the desired vent location. A vent free gas stove is relatively easy to install and usually comes as standalone packages.