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Arctic Tern Window 450x610 / 17.72"x24.01"

Original price $619.00 - Original price $693.00
Original price
$619.00 - $693.00
Current price $619.00

Expedition Upfitter is proud to introduce Arctic Tern acrylic windows. These RV windows exude quality in every aspect and are designed to meet the needs of serious travellers and overlanders. Unlike slider windows, these units allow the full size of the window to be open for maximum ventilation.

They feature double-pane acrylic windows they are made in Europe and meet strict European ECE standards. These windows can be set at 10 and 35 degrees open for the 300mm size, and 20, 40, and 60 degrees for all of the other sizes. The windows also feature a semi-lock position that allows air in during stormy conditions. A separate interior cover panel contains the retractable fine mesh insect screen on the top, and a blackout blind with the reflective exterior on the bottom. These can be used separately or together for infinite combinations of privacy and fresh air. The blind also creates a second dead air space for maximum thermal efficiency in very cold conditions. The screwless clamp style design provides a simple and secure fixing method. Combined with the easy fit internal blind ensemble and optional curtain tracking a quality finish to your RV is assured.

Arctic Tern has a weight savings of over 60% of similarly sized glass windows. Lastly, these windows can serve as an emergency exit. We also offer a 500mm x 700mm roof hatch with similar blinds, screens, and built-in LED lighting.


Our windows are warranted for one year against defects in workmanship and materials. We offer a complete in-house part and service department.

Take a look at these additional features:

  • Heavy-duty powder-coated aluminum frame
  • Grey, double glazed acrylic panel, UV resistant, certified to European ECE standards.
  • Telescopic strut supports hold window securely when open
  • Push-button locking handles
  • High-quality rubber seals
  • Three-panel thicknesses to accommodate 24-34mm, 34-44mm, and 45-54mm, NEW 64-74mm
  • Three-stage opening position on all windows greater than 300mm and two-stage up to 300mm.
  • 9 sizes to choose from
  • Easy installation
  • Full 1-year manufacturer’s warranty
  • The clever design means a 24% increase in opening size/ventilation access compared to leading competitors (based on a 450×500 window)
  • Pull down block out blind with a reflective backing.
  • Pull down insect blind.
  • Powder-coated aluminum frame.
  • All windows are equipped with a semi-lock position for ventilation during windy conditions while parked.
  • The blind system can be activated individually or locked together and positioned as required.
  • Screw-less clamp design provides a simple and secure fixing method
  • Windows are ADR approved and can be used on motor homes.
  • Shipped directly from our warehouse in the USA. 

Additional documentation can be found on our
Resource Page- including installments and fitments. 

    Customer Reviews

    Based on 4 reviews
    Matt Cobb
    Good size for multiple reasons plus a trim solution for various wall thicknesses

    I purchased 3 of these 450x610 windows (along with a few others of various sizes). I like the size because they are small enough to easily fit in many areas yet large enough to act as an emergency egress or escape hatch. Safety is an important feature in my build. The retractable blinds and bug screen are a brilliant feature. I like the clever use of the automotive style gaskets with clamping ring (no adhesives required), though the clamping screws require a bit of patience... My walls finished out to 3-1/8 inch thick. The largest trim ring available was for wall thicknesses of 2.91 inches max. I purchased longer SS screws (30mm). This left me with an unsightly 3/8" gap between the window frame and clamp ring. I solved this by simply using strips of 1/16" Polywall utility panel obtainable at most any big -box hardware stores. I cut the panel lengthwise into 2-1/2" strips. This gave me about a 1/4" of lip beyond the clamp-ring protruding into the blind/screen frame area flush creating a nice, finished look. I secured the strips using Sil-Bond clear RTV 4500 and a few strategically place rivets. I cut tight fitting plugs from scrap 2" xps foamboard to evenly apply pressure around the strip as the RTV cured overnight, then reinstalled the blinds. Hope this helps others with their projects! I truly am very pleased with the quality and engineering of these windows! They are vastly superior to anything in the North American RV industry!

    Joel R.
    Window for my sliding door

    Great size for my sliding door. I had a mix-up with the trim ring and ordered the wrong size. I was able to order the correct size and Expedition Upfitter was super helpful with this. Thanks for such great customer service.


    Our window arrived Monday in pristine condition. I would like to thank you very much for your help and personal attention. I unpacked it and began my template yesterday, finishing my day by applying the template to my already roughed-out PVC frame. This morning I am cleaning up some cuts to insure a "click" fit in the Promaster. I will be documenting all this process and posting it up on a couple of Promaster build-out forums. I will also let them know what a pleasure you have made my experience. There has been some concern, me included, about Arctic Tern sourcing out window sales. My concerns no longer exist and I will gladly return to you for the last two windows we will need. I will give you a four-star rating. As the last two are back door windows and will not contaminate the interior with metal shards during installation, they will be a couple of months out as I build and install my cabinets, electrical and such.
    Thanks again Katie!

    Greg G.
    Great Instructions

    I was pretty hesitant before tackling the install and cutting a hole in my camper. The instructions were great and the customer service from EXUP was top notch!

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