The Heat insulation and sound absorption device is a comprehensive system of thermal and acoustic panels designed to significantly reduce engine heat and noise inside the HOWO MAX 4X2 cab. This genuine HOWO kit includes upper and lower noise reduction boards, mounting brackets, and all required fasteners – engineered to create a quieter, more comfortable driving environment. When you choose authentic Howo Parts, this Heat insulation and sound absorption device guarantees OE fitment, superior insulation performance, and easy installation. Below are detailed descriptions of every component included with this Heat insulation and sound absorption device.
The left front upper bracket is a precision‑stamped steel support that secures the upper left noise reduction board to the cab structure. This component of the Heat insulation and sound absorption device is coated with a corrosion‑resistant finish and includes mounting holes that align with the factory points.
It provides a rigid mounting base, ensuring the insulation panel remains firmly in place and effectively blocks engine heat and noise from the driver’s side. The bracket is designed to withstand engine vibration and thermal cycling, contributing to the long‑term integrity of the entire Heat insulation and sound absorption device.
The upper left noise reduction board is a high‑density acoustic panel that covers the upper left portion of the engine tunnel and firewall. This component of the Heat insulation and sound absorption device is made from multi‑layer felt and foam composite, with an aluminized heat‑reflective backing.
It absorbs engine noise and blocks thermal radiation, reducing cabin sound levels by up to 8 dB. The board is precision‑cut to fit the left side of the cab, and its surface is treated to resist oil, moisture, and wear. This Heat insulation and sound absorption device board is essential for driver comfort, especially during long‑haul operations.
The upper right noise reduction board is the symmetrical counterpart for the passenger side, delivering identical acoustic and thermal performance. This Heat insulation and sound absorption device panel covers the upper right firewall area,
providing balanced insulation across the entire cab front. Its construction mirrors the left board, ensuring uniform noise reduction and heat blockage. Together with the left board, it forms a complete upper barrier that significantly enhances the overall effectiveness of the Heat insulation and sound absorption device.
The lower left noise reduction board extends the insulation coverage down to the floor level on the driver’s side. This Heat insulation and sound absorption device panel is shaped to fit around the pedal box and steering column, providing full coverage where engine heat and road noise are most intrusive.
It is constructed from the same durable composite material, with an added reinforcement layer to withstand foot traffic and wear. The lower left board is a critical component of the Heat insulation and sound absorption device for reducing floor‑transmitted noise and keeping the footwell area cool.
The right front upper bracket is the steel support that attaches the upper right noise reduction board to the cab. This Heat insulation and sound absorption device bracket is identical in design and strength to the left bracket,
ensuring secure mounting on both sides. Its precise hole alignment and robust construction guarantee that the insulation panel remains stable and effective, even under severe vibration. This bracket is an essential part of the mounting system for the Heat insulation and sound absorption device.
The left front lower bracket supports the lower left noise reduction board at the bottom edge. This Heat insulation and sound absorption device component is formed from heavy‑gauge steel and includes a rubber cushion to dampen vibration. It ensures that the lower panel remains flush against the floor,
preventing gaps that could allow noise or heat intrusion. The bracket is zinc‑plated for corrosion resistance and is a vital part of the overall mounting system for the Heat insulation and sound absorption device.
Two lower brackets are supplied to support the central and lower sections of the noise reduction boards. These brackets are designed to attach to the cab floor and transmission tunnel, providing additional fixing points for the Heat insulation and sound absorption device panels.
They are made from stamped steel with a durable e‑coat finish and include rubber isolators to prevent rattles. The lower brackets are essential for maintaining the correct position of the insulation material, ensuring that the Heat insulation and sound absorption device performs optimally across the entire firewall area.
Three upper brackets are used to secure the top edges of the noise reduction boards to the cab structure. These brackets are positioned along the upper firewall and cowl area, providing a strong, stable attachment point for the Heat insulation and sound absorption device.
They are fabricated from high‑strength steel with a black powder‑coat finish and feature slotted holes for easy adjustment during installation. The upper brackets ensure that the insulation panels are held firmly against the metal surface, preventing sagging and maintaining full coverage of the Heat insulation and sound absorption device.
Two right rear upper brackets are provided to support the rear upper corner of the right side insulation. These brackets are designed for the specific contour of the rear passenger side,
ensuring the Heat insulation and sound absorption device covers the full width of the cabin. They are made from the same high‑quality steel and include anti‑vibration pads to eliminate squeaks. These brackets complete the mounting system, ensuring that every panel of the Heat insulation and sound absorption device is securely held in place.
Multiple hexagon flange bolts are supplied in various lengths to secure the brackets and panels of the Heat insulation and sound absorption device. These bolts feature an integral flange that distributes clamping load evenly, eliminating the need for separate washers. They are made from grade 8.8 steel with a zinc‑plated finish, providing excellent corrosion resistance and high tensile strength.
Proper torquing of these bolts is essential for maintaining the integrity of the Heat insulation and sound absorption device, preventing any movement that could reduce its effectiveness. The bolts are designed for easy installation using standard socket tools, ensuring a secure and vibration‑proof assembly.
A total of 36 large washers (28 + 8) are included to distribute the clamping load under the bolt heads and nuts across the insulation panels and brackets. These washers are made from hardened steel with a zinc coating,
preventing the bolt head from damaging the softer insulation material. They ensure even pressure distribution, which is critical for maintaining a consistent seal and preventing the Heat insulation and sound absorption device from loosening over time. The washers are reusable and are an essential component for a durable, long‑lasting installation of the Heat insulation and sound absorption device.
Eighteen M6 hex flange nuts (4 + 14) are provided to secure the smaller brackets and fasteners of the Heat insulation and sound absorption device. The flange acts as a built‑in washer,
providing a large bearing surface and a self‑locking action that resists loosening under vibration. These nuts are made from zinc‑plated steel and are torqued to 10 Nm. They are essential for securing the lightweight brackets that support the edges of the insulation panels, ensuring that the entire Heat insulation and sound absorption device remains intact and effective.
Three M14x1.5 hex bolts with serrated flanges are used for the main structural connections of the Heat insulation and sound absorption device. These high‑strength bolts are grade 10.9 and feature a serrated flange that bites into the mating surface, providing a positive locking action that prevents loosening even under severe vibration.
They are torqued to 180 Nm and are critical for securing the heavier upper and lower brackets. The serrated flange eliminates the need for separate washers, simplifying installation and reducing the number of components. These bolts are a key part of the Heat insulation and sound absorption device, ensuring that the insulation system remains securely attached to the cab structure.
Three M14x1.5 flange nuts with toothed faces are used in conjunction with the serrated bolts to secure the main brackets. These nuts are made from grade 10.9 steel and feature an integral flange with teeth that provide a positive locking action.
They are torqued to 180 Nm and are designed for single‑use; they must be replaced if removed. The toothed flange ensures that the nut cannot back off under the constant vibration experienced by the Heat insulation and sound absorption device. Using genuine nuts guarantees the correct hardness and thread fit, preventing galling or stripping during installation.
Three M10 flange bolts are used to secure the lower brackets and other medium‑load attachments of the Heat insulation and sound absorption device. These bolts are grade 8.8 with a zinc‑plated finish, torqued to 40 Nm. The flange head provides a large bearing surface, eliminating the need for washers and ensuring even clamp load distribution.
These bolts are essential for the reliable fastening of the Heat insulation and sound absorption device, preventing any movement that could compromise the insulation’s performance. Their length and thread pitch are precisely matched to the bracket thickness, ensuring full thread engagement.
Heat insulation and sound absorption device – genuine HOWO complete cabin insulation and mounting kit for MAX 4X2
This Heat insulation and sound absorption device includes all upper and lower noise reduction boards, ensuring full coverage of the firewall and floor. With this Heat insulation and sound absorption device, you can effectively reduce engine heat and noise, creating a more comfortable cab environment for both driver and passengers.
The boards in this Heat insulation and sound absorption device are made from multi‑layer felt and foam composites that provide excellent sound absorption and thermal resistance. The Heat insulation and sound absorption device materials are resistant to oil and moisture, ensuring long‑lasting performance in the demanding truck environment.
All brackets for the Heat insulation and sound absorption device are stamped from high‑strength steel with corrosion‑resistant coatings, ensuring a secure, rattle‑free fit. The Heat insulation and sound absorption device brackets are designed to align perfectly with the factory mounting points, simplifying installation and guaranteeing optimal panel positioning.
This Heat insulation and sound absorption device kit comes complete with every bolt, nut, and washer required for installation. Using the correct fasteners ensures a vibration‑proof assembly that will remain secure for the life of the vehicle. The Heat insulation and sound absorption device hardware is grade 8.8 or 10.9, providing reliable clamping force.
The Heat insulation and sound absorption device creates a multi‑layer barrier between the engine compartment and the cabin interior. The noise reduction boards are positioned directly against the firewall and floor, absorbing airborne engine noise and blocking radiant heat.
The boards are held in place by a network of brackets that distribute the load evenly, preventing sagging or gaps. The reflective aluminized backing on the boards reflects heat back towards the engine, reducing the temperature of the metal panels.
The acoustic foam layer absorbs sound waves, reducing interior noise levels by up to 10 dB. The fasteners and washers ensure that the entire Heat insulation and sound absorption device remains securely attached, even under the vibration of a heavy diesel engine.
By reducing heat ingress, the Heat insulation and sound absorption device also improves the efficiency of the air conditioning system, leading to lower fuel consumption. For drivers, this translates to a quieter, cooler, and more comfortable cab, reducing fatigue on long journeys.
Before installation, remove any existing insulation and clean the cab surfaces. Position the upper left and upper right noise reduction boards against the firewall, aligning them with the bracket mounting holes. Secure the boards using the left and right front upper brackets, and fasten them with the M8 flange bolts and large washers. Install the lower left noise reduction board and secure it with the left front lower bracket. Attach the lower and upper brackets to the floor and cowl,
ensuring all panels are correctly positioned. Insert the M10 and M14 bolts for the main brackets, torquing to specification. Finally, install the right rear upper bracket to secure the rear edge.
Check that all panels are flush and that the Heat insulation and sound absorption device is free from wrinkles. Reinstall the floor mats and trim panels. The Heat insulation and sound absorption device is now ready to deliver its full benefits.
If the Heat insulation and sound absorption device produces a rattling noise, check that all brackets are securely fastened and that the panels are not vibrating against the metal. Tighten any loose bolts. If the cab remains hot,
inspect the boards for gaps; adjust the brackets to close any openings. If the noise reduction is insufficient, ensure that the boards are correctly seated and that the foam layer is not compressed or damaged.
In areas where the Heat insulation and sound absorption device has been removed for service, replace any worn snap rings or fasteners. Always use genuine components to maintain the performance of the Heat insulation and sound absorption device.
The Heat insulation and sound absorption device requires minimal maintenance. Periodically inspect the boards for signs of wear, moisture absorption, or oil contamination. Clean any spilled liquids immediately to prevent degradation. Check the brackets for corrosion and the fasteners for tightness; retorque if necessary.
The Heat insulation and sound absorption device is designed to last the life of the vehicle, but damaged panels should be replaced promptly. Keeping the insulation clean and dry ensures its thermal and acoustic properties are maintained.
This Heat insulation and sound absorption device is specifically designed for the HOWO MAX 4X2 tractor and is compatible with all production years from 2018 onward. The boards and brackets are shaped to fit the standard cab dimensions, providing full coverage of the firewall and front floor. The kit is also suitable for SITRAK C7H and HOWO T7H models that share the same cab architecture. It is not compatible with older A7 or WD615 models, which have different panel shapes and mounting points. Always verify your cab type before ordering.
Aftermarket insulation kits often use sub‑standard materials that degrade quickly, losing their acoustic and thermal properties within months. Generic brackets may not fit correctly, leading to gaps that allow heat and noise to bypass the insulation. Non‑genuine fasteners can corrode or fail, causing panels to loosen and rattle.
A poorly insulated cab can result in excessive driver fatigue, increased stress, and reduced concentration, which can compromise safety. Genuine HOWO Heat insulation and sound absorption device components are manufactured to SINOTRUK’s exacting standards, using certified materials, precision‑formed brackets, and high‑grade fasteners.
The small additional cost of a genuine Heat insulation and sound absorption device is far outweighed by the improvement in driver comfort, productivity, and overall vehicle value. For fleet operators, using genuine insulation ensures consistency across the fleet and reduces driver turnover due to cab comfort issues.
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