The most common fryer models are electric and gas fryers. In the United States, whole mature chickens are marketed as fryers, broilers, and roasters. Commercial fryers with infrared heating or convection heating are efficient, but often expensive. Counter-top air fryers provide an alternative to traditional oil frying. Over time, deep fryers have evolved into air fryers and propane deep fryers. There are various oil roasting methods from continuous, batch and curtain fryers. Gas fryers heat up more quickly and to a higher cooking temperature than electric fryers. Pressure Fryers or the company's Countertop Ventless Fryers. Most air fryers have temperature and timer adjustments that allow more precise cooking. However, these fryers work very well for lightly breaded foods. Commercial fryers are generally available in mild steel or stainless steel. For larger production quantities, continuous vacuum fryers are available. In the kitchen, dark fryers are typically prepared differently from white fryers. Most commercial deep fryers are equipped with automatic fire suppression systems using foam. This makes gas power especially popular in floor model fryers.