Venting
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Deflecto 17-1/4" x 11-1/2" Dryer Vent Box with Connector, White (MPN: DVBOX)SKU: 1899287$27.02 25% off $36.17 -
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Lukjan 4" 90 Degree Smoke Pipe Furnace Elbow, Adjustable, 26GA (MPN: RX530426)SKU: 2010949$8.68 27% off $11.90 -
Armstrong Air & Concord 16" x 25" External Filter Rack Kit (MPN: AFILT524-1)SKU: 1940612$63.94 23% off $82.64 -
Hart & Cooley 4" 90 Degree Elbow, Adjustable, Type B Gas Vent (MPN: 16108)SKU: 111726$38.83 13% off $44.69 -
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Lukjan 6" 90 Degree Smoke Pipe Furnace Elbow, Adjustable, 26GA (MPN: RX530626)SKU: 2010953$11.16 23% off $14.40 -
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Lukjan 3" 90 Degree Smoke Pipe Furnace Elbow, Adjustable, 26GA (MPN: RX530326)SKU: 2010947$8.58 17% off $10.39 -
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Z-Flex 6" x 35' Oil Liner Kit, Stainless Steel (MPN: 2OILKTX0635)SKU: 104436$782.90 23% off $1,018.63 -
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Lukjan 5" 90 Degree Smoke Pipe Furnace Elbow, Adjustable, 26GA (MPN: RX530526)SKU: 2010951$10.50 21% off $13.36 -
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Lukjan 7" 90 Degree Smoke Pipe Furnace Elbow, Adjustable, 26GA (MPN: RX530726)SKU: 2010955$13.63 23% off $17.63 -
Lukjan 6" x 4" Smoke Pipe Duct Increaser/Reducer, Tapered, 26GA (MPN: RX410604)SKU: 2010931$17.43 23% off $22.57
Venting
Every properly functioning building depends on a complete, correctly sized, and code-compliant venting system to manage combustion gases, distribute conditioned air, and protect occupants from harmful exhaust. At Plumbing Supply And More, our venting category brings together an extensive selection of over 400 products covering everything from smoke pipe and furnace elbows to chimney liners, dryer vent boxes, concentric vent kits, duct insulation, and a full range of sheet metal duct fittings.
Whether you are a licensed HVAC technician, a plumber, or a seasoned contractor, having access to the right components from trusted brands like Lukjan, Hart & Cooley, Z-Flex, Reflectix, and Deflecto means the difference between a reliable, long-lasting installation and one that underperforms or fails inspection.
The Role of Venting in HVAC, Combustion & Air Distribution Systems
Proper venting is the backbone of any heating, ventilation, and air conditioning system, and its importance extends well beyond simply routing exhaust gases outside. A venting system serves three distinct functions: expelling combustion byproducts from gas and oil appliances, distributing conditioned air throughout a structure, and managing moisture-laden exhaust from appliances like clothes dryers.
When any part of this system is undersized, improperly installed, or degraded over time, the consequences range from reduced equipment efficiency to dangerous backdrafting of carbon monoxide into occupied spaces. Understanding the specific requirements of each application — whether it involves a natural draft oil furnace, a Category IV condensing gas appliance, or a forced-air duct network — is essential before selecting venting components.
Every component in a venting system must be matched to the appliance category, the fuel type, and the installation environment to deliver safe, code-compliant performance. The National Fire Protection Association's NFPA 211 and NFPA 54 establish the baseline standards that govern how venting products are selected, installed, and maintained across residential and commercial applications.
Smoke Pipe, Furnace Elbows & Tees for Oil & Gas Appliance Exhaust
Smoke pipe, also referred to as single-wall black stovepipe or connector pipe, forms the visible connection between a furnace, boiler, or water heater and the chimney flue or venting terminal. Plumbing Supply And More carries Lukjan round smoke pipe in 26-gauge galvanized steel across a full range of diameters — 3-inch, 4-inch, 5-inch, 6-inch, and 7-inch — available in standard 2-foot sections.
The 26-gauge construction provides the rigidity needed for residential and light commercial connector runs, and is suited for use with oil-fired furnaces, gas furnaces, boilers, and heating stoves. Single-wall connector pipe must always be used in the interior of a building and never penetrate a wall, floor, ceiling, or exterior surface — those transitions require Type B double-wall gas vent or a listed chimney liner product.
Adjustable 90-degree furnace elbows are equally important in any smoke pipe installation, as they allow the installer to navigate tight mechanical room constraints without compromising the draft angle or the overall run length. Lukjan's adjustable furnace elbows are offered in both 26-gauge and 30-gauge versions across 3-inch, 4-inch, 5-inch, and 6-inch diameters to accommodate a wide range of appliance collar sizes and clearance conditions.
The 30-gauge versions are typically used in lighter-duty or shorter connector applications, while the 26-gauge elbows are the preferred choice for oil appliances and installations requiring greater structural integrity. Smoke pipe tees in 6-inch and 7-inch diameters with 15-inch legs are also available for branch connections, clean-out access, and manifolded appliance venting configurations.
Type B Gas Vent & Concentric Vent Kits for High-Efficiency Appliance Installations
Type B double-wall gas vent is the listed, code-required venting product for most Category I natural draft and fan-assisted gas appliances, including gas furnaces, gas boilers, and gas water heaters. Hart & Cooley's Type B gas vent products represent a professional standard in the industry, and the 4-inch 90-degree adjustable elbow is a foundational component in virtually any Type B installation.
Unlike single-wall smoke pipe, Type B vent features an inner aluminum liner separated from an outer galvanized steel jacket by an air space, which dramatically reduces heat transfer to combustible materials and allows reduced clearances. Correct clearance to combustibles, proper support intervals, and the use of listed Type B vent cap terminations are all critical to a code-compliant installation under NFPA 54 and ANSI Z223.1.
Concentric vent kits serve an entirely different application: they are designed for condensing (Category IV) appliances such as high-efficiency gas furnaces and combi-boilers that require a two-pipe system — one pipe for combustion air intake and one for flue gas exhaust. The 3-inch concentric vent kit available at Plumbing Supply And More bundles both pipes into a single through-wall or through-roof termination, simplifying installation and reducing the number of penetrations in the building envelope.
Concentric terminations are particularly valuable in tight mechanical closets or when exiting through a rim joist or sidewall, as the coaxial design keeps supply and exhaust flows separated while maintaining a compact footprint. Selecting the correct concentric vent diameter requires referencing the appliance manufacturer's installation manual, as condensing appliances have strict maximum equivalent length limitations that govern vent system sizing.
Chimney Liners: Stainless Steel & Aluminum Solutions for Flue Relining
Relining a deteriorated or undersized masonry chimney is one of the most critical safety upgrades a building can undergo, and the choice of liner material is directly tied to the fuel type and appliance category being vented. Z-Flex is one of the most respected names in flexible liner technology, and Plumbing Supply And More carries Z-Flex liner kits in configurations suited to both oil and gas appliances.
The Z-Flex stainless steel oil liner kit in 6-inch by 35-foot configuration is engineered for use with oil-fired boilers and furnaces, where flue gas temperatures are higher and condensation is more acidic than with gas appliances. Stainless steel is the material of choice for oil flue gas because it resists the sulfuric acid condensate that forms when oil combustion gases cool below their dew point temperature inside the flue.
For gas appliances, the Z-Flex aluminum liner kit in 5-inch by 35-foot format provides a cost-effective solution where Type AL29-4C stainless is not required, typically in natural draft gas appliances venting at moderate temperatures. The 5-inch by 35-foot oil liner kit in stainless steel rounds out the selection for smaller-diameter oil appliance relining projects.
When selecting a liner diameter, the connector pipe size at the appliance collar is not always the correct liner diameter — the liner must be sized per appliance manufacturer specifications and local code, accounting for total connected BTU load, vertical flue height, and the number of elbows in the system. Liner kits that include a top plate, insulation blanket, and connector tee provide everything needed for a complete, single-source reline from the appliance collar to the flue cap termination at the chimney crown.
Dryer Vent Boxes & Recessed Vent Accessories for Space-Efficient Installations
Dryer venting is a dedicated exhaust pathway that must be kept entirely separate from any combustion appliance or HVAC venting system, as it carries hot, moisture-laden air and lint that poses a serious fire hazard if allowed to accumulate. Plumbing Supply And More carries recessed and surface-mounted dryer vent boxes from Deflecto and Lukjan designed to solve the most common dryer installation challenge: moving the appliance close enough to the wall while maintaining proper hose clearances.
The Deflecto 17-1/4-inch by 11-1/2-inch dryer vent box with connector mounts inside the wall cavity and accepts a 4-inch dryer duct connection at the back, allowing the dryer to sit nearly flush against the wall. Lukjan recessed dryer vent boxes in 2-inch by 4-inch and 2-inch by 6-inch wall stud configurations provide the same functionality in a low-profile design for either standard or thicker exterior wall construction.
Recessed vent boxes eliminate the dangerous accordion-style flexible hose that gets kinked or crushed when a dryer is pushed against a wall, replacing it with a rigid 4-inch duct takeoff that maintains full airflow and dramatically reduces lint accumulation at the connection point. Proper dryer venting also requires the correct exterior wall cap with backdraft damper and adherence to the maximum run lengths established in the International Residential Code (IRC) Section M1502.
Duct Insulation: Double Bubble & Reflective Wrap for Thermal Performance
Insulating ductwork that runs through unconditioned spaces like attics, crawlspaces, and garages is one of the highest-return energy efficiency improvements available in any building, directly reducing HVAC runtime and improving delivery temperatures at supply registers. Plumbing Supply And More carries double bubble duct insulation in large-format rolls including 48-inch by 100-foot and 50-inch by 48-inch options for duct wrapping applications.
Double bubble insulation features two layers of polyethylene air bubbles laminated between reflective foil facing on both sides, providing both a thermal break and a radiant barrier that resists heat gain in summer and heat loss in winter. The Reflectix 48-inch by 100-foot duct insulation roll is a professional-grade reflective product commonly used in attic duct systems where high ambient temperatures make conventional fiberglass duct wrap less effective.
Effective duct insulation must be installed with sealed lap seams using foil-faced pressure-sensitive tape to prevent thermal bridging and moisture intrusion at seams. In Climate Zone 3 and higher, the IECC (International Energy Conservation Code) mandates minimum duct insulation R-values for ducts in unconditioned spaces, making proper wrap thickness and sealing non-negotiable on new construction and renovation work.
Ductboard, Trunk Duct, Register Boots & Sheet Metal Fittings for Air Distribution
Sheet metal duct fittings and ductboard components are the connective tissue of any forced-air distribution system, and the accuracy of their sizing, gauge, and configuration has a direct impact on system static pressure, airflow balance, and overall equipment performance. Plumbing Supply And More stocks an extensive range of Lukjan duct fittings including 90-degree round-to-oval boots, oval register stack heads, adhesive duct takeoffs with integral dampers, and ductboard top and tab collar takeoffs.
The 6-inch 90-degree round-to-oval boot converts a round duct run into an oval profile suited to low-profile floor and wall register installations, while the 6-inch by 10-inch oval register stack head terminates a ductboard or sheet metal stack at the register location. Duct takeoffs with integral volume dampers — available in both adhesive-mount and ductboard tab-collar configurations — allow precise airflow adjustment at each branch without requiring separate inline damper hardware.
Return air panning sheets, such as the Thermo 16-inch by 47-1/2-inch return air panning sheet, convert the stud or joist bay itself into a return air plenum, a common method in residential new construction that minimizes the amount of sheet metal required for return air routing. The Armstrong Air & Concord 16-inch by 25-inch external filter rack kit integrates into the return air system at the air handler cabinet, providing an accessible location for the air filter without requiring the unit to be opened for routine filter changes.
Lukjan drain pans — such as the 26-inch by 56-inch model — protect ceilings and floors from condensate overflow at horizontal air handler installations and are required by most mechanical codes for any air handler installed above a finished ceiling. Selecting the correct drain pan size requires matching the pan to the air handler footprint with a minimum 1-inch overflow clearance on all four sides.
Termination Screens, B-Bent Vent & Stainless Steel Single-Wall Components
Termination screens protect vent openings from pest intrusion, debris accumulation, and wind-driven rain while maintaining the open flow area required for proper appliance draft and combustion air delivery. Termination screens must be sized to the vent diameter and inspected regularly, as blockages at the vent terminal can cause dangerous pressure imbalances that lead to appliance lockout or flue gas spillage into the occupied space.
B-bent fittings are a specialized form of Type B double-wall vent connector used to make directional changes within a venting system where standard round elbows would exceed clearance limits or create excessive flow restriction. Stainless steel single-wall components serve applications where high flue gas temperatures, corrosive condensate, or proximity to high-moisture environments would degrade galvanized or aluminum materials over normal service life.
Why Shop Venting Supplies at Plumbing Supply & More?
Plumbing Supply And More brings together professional-grade venting products from trusted manufacturers — including Lukjan, Hart & Cooley, Z-Flex, Deflecto, Reflectix, Armstrong Air & Concord, and Thermo — in a single destination built for contractors, tradespeople, and serious professionals. With over 400 venting SKUs spanning smoke pipe, Type B gas vent, chimney liner kits, duct insulation, register fittings, dryer vent boxes, concentric vent kits, and sheet metal accessories, finding the right component for any venting job is fast and straightforward.
Free shipping on qualifying orders of $150 or more makes it practical to stock a job site or replenish a service truck without absorbing excessive freight costs. Whether you are relining a deteriorated masonry chimney, adding a branch takeoff to an existing duct system, or installing a new concentric vent terminal for a condensing boiler, Plumbing Supply And More delivers the depth of selection and recognized brand names that professionals depend on to complete every venting installation correctly the first time.
