Hello everyone,
as part of my house renovation, the existing building will receive 10cm (4 inches) of exterior wall insulation (mineral-based).
In this context, I want to prepare for the installation of decentralized ventilation units in some rooms.
Preparing means running electrical wiring under the insulation to the planned location, so that later, if needed, the ventilation unit can be installed with a core drill hole without having to open up much inside the existing structure.
My plumbing specialist (from whom I am also sourcing the ventilation units) suggested that I should already run the cable into the interior space and store it in a flush-mounted electrical box.
Has anyone here had experience with the best way to prepare for this?
Should the cable be routed into the interior or not?
What are the options for safely storing the cable in an electrical box without causing too much damage indoors?
Eventually, the ventilation unit needs to be connected. So, there must be a way to connect from the box to the ventilation unit later—what is the best approach for this?
Is there anything else to consider, or has anyone done something similar and can share some tips?
Best regards,
Chris
as part of my house renovation, the existing building will receive 10cm (4 inches) of exterior wall insulation (mineral-based).
In this context, I want to prepare for the installation of decentralized ventilation units in some rooms.
Preparing means running electrical wiring under the insulation to the planned location, so that later, if needed, the ventilation unit can be installed with a core drill hole without having to open up much inside the existing structure.
My plumbing specialist (from whom I am also sourcing the ventilation units) suggested that I should already run the cable into the interior space and store it in a flush-mounted electrical box.
Has anyone here had experience with the best way to prepare for this?
Should the cable be routed into the interior or not?
What are the options for safely storing the cable in an electrical box without causing too much damage indoors?
Eventually, the ventilation unit needs to be connected. So, there must be a way to connect from the box to the ventilation unit later—what is the best approach for this?
Is there anything else to consider, or has anyone done something similar and can share some tips?
Best regards,
Chris
J
jens.knoedel3 Jan 2024 15:59Install the fans right away. Many come with a standard power cable that can simply be plugged into an outlet for now. You can install proper wiring later and then connect the fans there. It might look like this with a regular cable and plug (stock photo):
By the way, if you prefer to run cables in advance (whether inside or outside), keep a few things in mind:
Do the fans need to be networked with each other?
==> this can be done via cable or wirelessly/Wi-Fi
==> if using cables, plan for an appropriate control cable
==> possibly loop power from one fan to the next for networking
P.S. If using cables, it is better to run them inside rather than outside.
By the way, if you prefer to run cables in advance (whether inside or outside), keep a few things in mind:
Do the fans need to be networked with each other?
==> this can be done via cable or wirelessly/Wi-Fi
==> if using cables, plan for an appropriate control cable
==> possibly loop power from one fan to the next for networking
P.S. If using cables, it is better to run them inside rather than outside.
X
xMisterDx6 Jan 2024 12:41Usually, this is done on the inside.
You would need to drill the core hole and then make a slot on the side for the cable. A plastic conduit is inserted into the core hole itself, and then the fan fits tightly into it. You won’t be able to pass the cable through there.
Make sure the core hole has a slight downward slope to the outside.
You should control each fan individually, so pull the cables separately into the distribution board (HAR) for maximum flexibility. Use 5x1.5 mm² (5x15 AWG) cable to have some spare capacity for additional functions.
However, is it even allowed according to fire protection regulations to run cables on the exterior wall beneath the insulation?
You would need to drill the core hole and then make a slot on the side for the cable. A plastic conduit is inserted into the core hole itself, and then the fan fits tightly into it. You won’t be able to pass the cable through there.
Make sure the core hole has a slight downward slope to the outside.
You should control each fan individually, so pull the cables separately into the distribution board (HAR) for maximum flexibility. Use 5x1.5 mm² (5x15 AWG) cable to have some spare capacity for additional functions.
However, is it even allowed according to fire protection regulations to run cables on the exterior wall beneath the insulation?
Sorry for the late reply, but I hadn’t had a chance to unpack a fan like that before. In the included manual, I found the following information (see picture). So, as described by @bigborre, the connection is made from the inside.
I think the best option right now would be to run a cable from the outside parallel to the respective drill hole—no idea how tight that space is—or possibly enlarge the core drill hole slightly to lay the cable through it. Perhaps inside, you could place the cable in a small surface-mounted box and run it to the fan in a slim cable conduit. It wouldn’t be visually appealing, though...
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