Ultra light weight and wind tunnel tested, our 4 inch NACA duct provides over 55% more airflow than standard 3" NACA ducts. Used in conjunction with 4" Neoprene Air Duct Hose and a 4 inch plenum results in maximum cooling efficiency for your cooling system.
NACA ducts bring air into a vehicle with minimal increase in drag. The purpose of a NACA duct is to increase the flow rate of air while not disturbing the boundary layer. When the cross-sectional flow area of the duct is increased, you decrease the static pressure and make the duct into a vacuum cleaner (without the drag effects of a standard scoop). The reason why the duct is narrow, then suddenly widens in a graceful arc is to increase the cross-sectional area slowly so that airflow doesn’t separate and cause turbulence and drag.
- Wind Tunnel Tested
- 55% more airflow
- 4" Carbon Fiber NACA Duct (Dual)
ChillOut Systems offers USPS Priority Mail (1-3 business days), USPS Priority Mail Express (overnight delivery guarantee), FedEx Ground (1-5 business days), FedEx 2 Day (2 business days) and FedEx Priority Overnight (next business day delivery). Costs for all orders are calculated based on your address and will appear in the checkout cart. International customers can select from USPS Priority Mail International® (6-10 business days) and USPS Priority Mail Express International ™ (3-5 business days).
We do ship internationally: Asia, Europe, and Australia. But we will ship anywhere as long as the customer covers shipping.
Orders typically take 2-5 business days transit time, depending on customer shipping address and chosen options at checkout.
To check the status of your order, please refer to the tracking number included in your shipping confirmation email. If you have questions about your order, please email us at email@example.com between Monday and Friday, 8:00 a.m. - 4:00 p.m. EST, and we will be happy to assist you.
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at firstname.lastname@example.org. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at email@example.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalized items), and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.