Usually when you buy a ventilator in a hospital, you buy a different one for children, you buy a different one for transport. This one will do everything, and it will do it at half the price and doesn't need compressed air.
病院が換気設備を購入した際に 子供達と交通機関にも 換気設備を買い与えるんです 費用も半減し圧縮空気も不要です