Purpose

Provide ventilation to the driver and battery.

Requirements

Driver

Open

Airflow

While no quantitative requirement is set in regs, I don’t think having a pinhole sized vent will pass. Since it is left to the discretion of the inspector, we should aim to size the vent and duct such that it would not “look unreasonable” if it was in an actual car. A 2in diameter opening + duct, or an equivalent cross-sectional area, sounds like a reasonable lower bound.

Filtration

While not required, since it is blowing at the driver’s face it would be nice if it did does not suck through fine particulate matter from the road. Intakes should also protect against water ingress.

Battery

Open

Airflow

The intake/exhaust and ducting should aim to maintain a cross sectional area greater than a 4in diameter circle. This standard is currently based on nothing other than it feels off to have ducting less than half the area of the fans, which are a circle approximately 6in in diameter.

Duct Path

Below are concept sketched for the duct path for both the intake and exhaust of the battery box.

The exhaust will be fairly straightforward, routing the ducts straight back towards the tail, where both ducts will converge to the same opening in the car’s tail.

For the intake, the ducts will be routes towards the edges of the aerobody, outside of the chassis (there seems to be a lot of room to work with so this shouldn’t be an issue?). The intake ducts will vent through the rear wheel wells, as they are fully enclosed.

For the dashboard, the aim is to minimize the space consumed by the duct routing. The proposed duct path is shown below, routing from the dashboard to the inner side of the wheel well in the shortest path possible.

Battery Box Duct Attachments

The rear duct attachments will be two separate parts, directing the air to two different slits placed on the car’s tail.

Development/INT/Ventilation/XV-INT-VENT008- single tail exhaust attachment

The intake ducts are to be routed into the rear wheel wells, so the attachments are going to be fastened to the front ribs on the left and right side. There is a 1in flange around the attachment to fasten it to the rib.

Development/INT/Ventilation/XV-INT-VENT001- front rib intake attachment

The attachment will have a vent built in to help eliminate the chances of water entering into the duct, as well as a downward slope within the tube section of the attachment to remove the chance of water seeping in.

Dashboard Duct Attachments

To secure the duct to the dashboard, an 2” diameter elbow-shaped attachment will be secured to a fan which is in turn secured to the dashboard. Another cylindrical attachment is used to attach the duct to the inner panel of the wheel well.

Filtration

We should try to maintain the same standard as for the driver, although there might be some room to relax it a little when it comes to fine particulate matter.