Installation Guide for M-Series Internal Mounting Sets
For models M-1JSET, M-2JSET, M-3MSET, M-3JSET, M-5JSET, M-7JSET, M-10JSET
The installation sets provide all the parts necessary for installing a Rosahl M-Series membrane into an enclosure. They include an M Series membrane and gasket, a fixing kit with screws and cable crimps and internal and external cover plates. The sets up to size 3 (models M-1JSET, M-2JSET, M-3MSET, M-3JSET) also include a VREG2 USBC power adapter board with VR2-FMC mounting base.
Features and Installation Guide
Minimising mechanical damage to the membrane during installation and use
Two plastic cover plates are included that reduce the risk of accidental mechanical damage to the membrane during and after installation. They are crucial in ensuring the integrity and longevity of the membrane under various conditions.
Material and Design
Both covers are manufactured from durable mid-grey PETG plastic, chosen for its resilience and suitability for demanding environments. The material ensures that the covers not only protect the membrane but also withstand external conditions without compromising their functionality.
Step-by-step Guide for Correct Installation
Preparation
- Ensure that the container or cabinet is airtight for optimal performance. If the enclosure is made of a moisture-permeable material or is not airtight, results may be suboptimal.
- Do not attempt to improve airtightness with silicone-based sealing materials, as the gases released during curing can damage the membrane and reduce its performance.
- Caulk or modified silicone (MS) sealants may be used but must be fully cured before membrane installation.
- Avoid using gaskets containing antioxidants as these can cause crystal formation on the surface of the membrane that reduce performance.
Membrane Installation
- Mount the membrane vertically in the centre of an inner side surface of the container or cabinet using the provided gasket.
- Do not attach the membrane to the top or bottom surfaces.
- Ensure free air circulation around the membrane after installation.
Preparing Installation and Moisture Discharge Holes
- Refer to the provided dimension tables to make the required moisture discharge and installation holes.
- For M-10J1R models, use the separate dimension table provided.
- Insert the included gasket between the membrane and installation plate.
- Secure the ROSAHL membrane using the screws from the fixing kit.
Final Steps
- Ensure all gaskets and sealants are compatible and properly cured prior to installation.
- Consult the relevant ROSAHL Instruction Manual for further details and troubleshooting.


Installation dimensions (mm)
Membrane | M-1J1R | M-2J1R | M-3M1R | M-3J1R | M-5J1R | M-7J1R | M-10J1R |
---|---|---|---|---|---|---|---|
Moistue discharge hole | 20 x 25 | 35 x 25 | 35 x 35 | 55 x 30 | 55 x 55 | 75 x 75 | 105 x 105 |
Dimension a | 37 | 52 | 48 | 65 | 76 | 108 | 152.5 |
Dimension b | 42 | 42 | 50 | 50 | 76 | 95 | 145 |
Dimention c | 18.5 | 26 | 24 | 32.5 | 38 | 50.5 | 72.5 |
Dimension d | - | - | - | - | - | - | 80 |
Screws | 4-M3 | 4-M3 | 4-M3 | 4-M3 | 4-M3 | 4-M4 | 8-M4 |
Supplied screw kit | M-5PKT | M-5PKT | M-5PKT | M-5PKT | M-5PKT | M-7PKT | M-7PKT |
Internal Cover
Example of an internal clip-on cover with a M3M1R
The internal cover is engineered for simplicity and efficiency. It clips directly onto the inside surface of the membrane, offering immediate protection during installation. The clip-on mechanism ensures a secure fit, reducing the risk of displacement or accidental removal.

3D Image of M-3J1R internal clip-on cover
External Cover
Example of an external cover for the M-3M1R
The external cover plate installs on the outside of the enclosure to protect the membrane. It uses the same bolts that secure the membrane in place, streamlining the installation process. This design allows for seamless integration with the additional protective measures listed below.
Benefits
The thoughtful design and material choice of the RTP covers reflect a commitment to safeguarding the membrane against mechanical damage. Whether installed in standard or challenging conditions, these covers provide reliable protection while accommodating additional protective measures for enhanced durability.
Additional Protective Measures
The RTP and CVP cover plates are compatible with enhanced membrane protection, including rain covers and environmental protective sheets to enhance the overall protection of the membranes in harsh or unpredictable environments.

Westside-International Ltd
Boston House, Downsview Road, Wantage, Oxfordshire, OX12 9FF. UK