Rectangular paipu mea he 'ano o ka pahu huinahalike pauku malamalama lahilahi-walled kila paipu, no hoi i ike i ke kila refrigerated kulou pauku. He ʻāpana kila ia me ke ʻano o ka ʻāpana ʻāpana ʻāpana a me ka nui i hana ʻia me ka Q235 wela a i ʻole ka ʻōwili a i ʻole ka coil ma ke ʻano he kumu kumu, i hana ʻia e ke kuʻi anu a laila hoʻoheheʻe kiʻekiʻe. Koe wale no ka mānoanoa o ka paia, ka nui kihi a me ka palahalaha o ka welau o ka pahu huinaha manoanoa a oi aku paha ma mua o ke ki'eki'e o ke ku'e. Hoʻokaʻawale ʻia nā paipu rectangular: ua māhele ʻia nā paipu kila i nā paipu kila ʻole a me nā paipu kila (seamed pipes) i ʻōwili ʻia i nā paipu like ʻole, ʻo ke anu, huki ʻia i nā paipu like ʻole, extruded seamless square pipes.