Lennox Hearth MPD-40 Series Pull and extend the inner flexible vent pipe, Route Flex Vent

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VERTICAL OR HORIZONTAL VENTING USING SECURE FLEX KITS AND COMPONENTS

Secure Flex venting kits and components may be used in any venting application where rigid Secure Vent (SV4.5) direct vent components can be used. All restrictions, clearances and allowances that pertain to the rigid piping apply to the flexible venting. Secure Flex kits may not be modified; also, under no circumstances may separate sections of flex pipe be joined together. Secure Flex kits may be added to the end of a vent run made up of rigid Secure Vent (SV4.5) vent sections provided that doing so does not violate any of the venting length, height, routing, horizontal to vertical ratio re- quirements or clearance considerations de- tailed in this manual.

Secure Flex kits come with an included adapter that can be fitted to the appliance collar or the inclined channel end of the last Secure Vent (SV4.5) vent section in a rigid system in the exact same fashion as any other Secure Vent section. Align the dimpled end of the adapter over the previously installed section or appliance collar, adjusting the radial alignment until the four lock- ing dimples of the adapter are aligned with the inlets of the four incline channels of the last vent section or collar. Push on the adapter until it fully engages, then twist the adapter clockwise run- ning the dimples down and along the incline channels until they seat at the end of the channels.

Attach the flexible vent to the adapter as follows (see also Figure 41):

A. Install the Inner Flex Pipe -

1.Install the small gear clamp loosely around the inner flexible vent pipe, push it back out of the way.

2.Apply a bead of Mill-Pac Black (700° F) high temperature sealant - Catalog No. 10K81) to the inner adapter collar, approxi- mately 1/2 inch from the end.

3.Pull and extend the inner flexible vent pipe.

4.Slide the inner flex pipe over the adapter collar. Ensure the flexible vent pipe completely engages the adapter collar to a distance of 1³⁄₄ inch from the end, and that it is free from damage or tears.

5.Slide the gear clamp down and tighten it fully to secure the flexible vent to the adapter inner collar approximately ³⁄₄ inch from the end of the flex.

6.Install threescrews120degreesapartthrough the flexible vent pipe and into the adapter collar just below the gear clamp to provide additional security to the connection.

NOTE: OUTER PIPE IS PULLED AWAY TO SHOW THE DETAIL OF THE INNER PIPE

Apply ONLY MIL-PAC BLACK HIGH TEMPERATURE SEALANT (Catalog No. 10K81) to the outside surface of both collars of the adapter (be especially careful to fill the grooves of the outer collar to be covered by the flexible pipe) and slide flexible pipe over inner and outer adapter collars.

1-3/4 in. (44 mm) Flexible Pipe and

Adapter Outer

Collar Overlap

Adapter

(SV4.5RF)

Figure 41

FLEX VENT

SECURING SCREW

(3 PLACES EQUIDISTANT JUST BELOW GEAR CLAMP)

GEAR

CLAMPS

1-3/4 in. (44 mm) Flexible Pipe and Adapter Inner Collar Overlap

SECURING SCREW

(3 PLACES EQUIDISTANT

JUST BELOW GEAR CLAMP)

Attach Adapter to Appliance

Collar, or Secure Vent Sections

B. Install the Outer Flex Pipe -

1.Install the large gear clamp loosely around the outer flexible vent pipe, push it back out of the way.

2.Apply a bead of Mill-Pac Black (700° F) high temperature sealant - Catalog No. 10K81) to the outer adapter collar; to the grooves of the collar which extend approximately 1 inch from the end and to the flat surface, approximately 1- 3/8 inches from the end.

3.Pull and extend the outer flexible vent pipe.

4.Slide the outer flex pipe over the adapter collar. Ensure the flexible vent pipe completely engages the adapter collar to a distance of 1³⁄₄ inches from the end, and that it is free from damage or tears.

5.Slide the gear clamp down and tighten it fully to secure the flexible vent to the adapter outer collar approximately 3/4 inch from the end of the flex.

6.Install three screws 120 degrees apart through the flexible vent pipe and into the adapter collar just below the gear clamp to provide additional security to the connection.

C. Route Flex Vent -

Ensure that the flex vent is properly routed to provide the required clearance. Do Not allow the flexible vent to bend in a radius tighter than 5" (127 mm). Refer to Figure 42. Support horizontal sections of flex with metal straps at 2 foot (0.61 m) intervals.

D. Install Firestop/Spacers at ceilings and walls -

When Secure Flex penetrates a wall or ceiling, a firestop/spacer is required: use the SF4.5 VF firestop/spacer for ceilings and the SF4.5 HF firestop/spacer for walls. See the appropriate sections and figures shown throughout the venting section for their installation requirments.

SF-12 or SF-18 Flexible Vent Section

5" (127 mm)

Radius Minimum

Figure 42

E. Attach Flex Vent to Termination - Secure Flex components can be purchased separately and attached to bulk lengths of Secure Flex flexible tubing cut to size at the job site. Secure the flexible vent to the Secure Flex terminations in the same manner (see Figure 41) as it was attached to the adapter.

Note: Secure Flex vent must be attached to Se- cure Flex terminations only. DO NOT substitute Secure Vent terminations or the Secure Vent adapter for Secure Flex components. The collars of Secure Flex terminations and adapters have a different circumference than that used with the Secure Vent pipe. Additionally, Secure Flex componentshaveanextendedlengthcentertube for use in attaching the flexible vent.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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Contents MPD-3530CPE MPD4540CNE-B OTL Report No -F-13-4Table of Contents Input of millivolt models is shown in the following table Electronic ModelsAll Models Location Typical LocationsAppliance and Vent Clearances Other heating/air conditioning ductingVent Termination Clearances Typical Installation SequenceVertical Vent Termination Clearances Roof Pitch FeetDetailed Installation Steps FramingRouting GAS Line Meter/regulator assembly Canadian Installation US Installation= Clearance to service regulator vent outlet Feet 91cm Inches 30cm33 1/4 37 3/4 12 7/8 845 959 327 45 1/4 40 1/4 26 11/16 44 3/4Framing with Square Horizontal Termination SV4.5HT-2 Front View Right Side View Top ViewMassachusetts 33 1/8 30 1/8 27 1/2 19 5/8 21 1/2 10 3/4 13/16 11/32Vent Restrictor Installation Rear Vent Installation of Vent RestrictorNew York City, NY Select Venting System Horizontal or VerticalVent Section Length Chart Vertical Straight InstallationSV4.5FA or SV4.5SCVent / Appliance Collar Connection Vertical Offset Installation12/12 Framing Dimensions for Roof Pitch10-1/2 267 mm 305 mm 10-1/2 17-3/4 267 mm 451 mmTable a Vertical Vent FIGURES/TABLESTable B FeetCeiling Firestop/Spacer Wall SV4.5VF Table DSV4.5HF CeilingPlan the vent run Install firestop/spacer at ceilingFrame exterior wall opening Support the vertical run sections See Section E onFor the last step , from outside the exterior Install the desired terminationInside the inner until the termination seats SV4.5RCHInches mm Exterior Wall ThicknessTable F Table GHorizontal Vent FIGURES/TABLES Table HH1H Table K Table LCeiling Install Firestop/Spacers at ceilings and walls Install the Outer Flex PipePull and extend the inner flexible vent pipe Pull and extend the outer flexible vent pipeWiring Optional Forced AIR Blower KIT Field WiringSIT and Honeywell Millivolt Wiring Electronic Wiring See orConnecting GAS Line Propane applicationsUse an open flame to check for leaks SIT Gas Valve Honeywell Piezo Ignitor Installing the Glass DoorElectronic Appliance Checkout Checking Appliance OperationHood Installation Burner Adjustments Flame Appearance and sootingFinishing Requirements Wall DetailsMantel Clearances Cold Climate InsulationInches mm TOPCat.No. Model No. Description Installation AccessoriesCat.No Model No Description Support PlateModel Description Cat Model DescriptionCanada GAS Conversion KitsMillivolt Honeywell Systems KitsMillivolt SIT Systems Shown on the tab Pilot for Honeywell Millivolt Gas ValveArrows shown in Figure Orifice Strip Tab PositioningPilot Assembly Ignitor AssemblyFlare Nut Clip

MPD-35 Series, MPD-45 Series, MPD-33 Series, MPD-40 Series specifications

The Lennox Hearth MPD-33, MPD-40, MPD-45, and MPD-35 Series are sophisticated and innovative products designed for both aesthetic appeal and functional heating efficiency. These multi-sided gas fireplaces are engineered to bring warmth and style to any space, making them a popular choice for homeowners looking to enhance their living environment.

One of the standout features of the MPD Series is their versatile design. Each model is available in different sizes with stylish options, catering to various room dimensions and decor styles. The MPD-33, MPD-40, and MPD-45 models provide flexibility in installation, while the MPD-35 offers extra depth for a more pronounced fire presence, making them suitable for both contemporary and traditional interiors.

A key characteristic of the Lennox Hearth MPD Series is its high-efficiency operation. These fireplaces are designed to maximize heat output while minimizing fuel consumption, resulting in lower energy bills. The innovative burner system produces a realistic flame effect that can be adjusted to create the perfect ambiance for any occasion. The use of advanced technology ensures that the heat generated is evenly distributed, enhancing overall comfort.

Safety is paramount in the design of the MPD Series. Each model is equipped with a state-of-the-art safety shut-off system that activates if the flame goes out, ensuring peace of mind for users. Additionally, the glass front not only provides a clear view of the flames but is designed to stay cool to the touch, making it safe for families with children and pets.

The efficiency of these models is further complemented by an optional remote control feature, allowing users to adjust the flame height and thermostat settings with ease. The MPD Series is also compatible with smart home systems, providing users with added convenience.

Overall, the Lennox Hearth MPD-33, MPD-40, MPD-45, and MPD-35 Series exemplify the perfect combination of efficiency, safety, and design. Their ability to blend function with visual appeal makes them an ideal choice for creating a cozy atmosphere in any room, from living areas to bedrooms. These fireplaces stand as a testament to Lennox's commitment to quality and innovation in home heating solutions. With advanced technologies and a focus on user comfort, the MPD Series is designed to meet the needs of modern homeowners seeking reliable and stylish heating options.
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