Ventilation in floors especially suspended timber floors is very important so as not to facilitate the build up of moisture within the floor structure.
Floor vent floor joist.
The rim joist fig.
Measure the width and length of the bottom of the vent with a measuring tape to determine the size of the hole you need to cut in the floor for the new vent location.
Drilling 4 inch holes in the joists would create a structural problem since there is a room and floor above that.
When the basement or crawl space has vents installed insulating joist bays.
Ventilation in suspended timber floors can be achieved by installing vents.
Joist bays the open spaces between floor joists are prime hosts for insulation under specific circumstances.
I don t have much of a problem except the hole for the dryer box ducting is at least a 4 hole box looks like the hole is more like 5.
B the framing member that runs around the perimeter of your house and that the floor joists butt into often gets riddled with large holes this space is the logical exit point for dryer and furnace vents big electrical service wires and fireplace fresh air intakes.
I will be venting down the wall to my floor joists and then running the vent about 8 along the floor joist cavity with the 4 duct terminating through the rim board and out the house.
This moisture build up can cause deterioration not only the timber joists but also any coverings placed over the joists.