I will be glad to check on this for you.
After consulting my online resources, they have checked with all my resources and unfortunately as it is a very old model, the manufacturer Reliance corp not listed any ventilation attachment or type for this model . That's why we are not able to find it in our website.
However, you do not need to worry !
You can contact the manufacturer's parts sale dept check this part , type, price and order it.
Let me help you with the manufacturer number.
You can get the Reliance corp at 1-888-837-1451 check this part , type, price and order it. Please refer the model# 5-40-NORT6 when you contact them to make your job easy.
I hope this helps!
Have a great day!
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