With nearly 80% open area, type "W" allows for the easy passage of dirt, debris, snow, and liquids and is essentially self-cleaning.
ມີພື້ນທີ່ເປີດກວ້າງເກືອບ 80%, ປະເພດ "W" ອະນຸຍາດໃຫ້ສໍາລັບ passage ງ່າຍໆຂອງຝຸ່ນ, debris, ຫິມະ, ແລະນໍ້າສະອາດແລະທໍາມະຊາດຕົນເອງທໍາຄວາມສະອາດ.