Copperfield Chimney 30" Ventis Cord Oak Vented Logs30" Ventis Cord Oak Vented Logs. Our Ventis Gas Log Sets are available for both natural gas and liquid propane. Our unique set features natural looking, hard refractory, hand painted logs, and a beautifully glowing ember bed which create a realistic look. NOTE: Cord Oak are for V1 Vented Series Burners Only. Features V1 Vented Series Burners Only Natural looking, hard refractory, hand painted logs, and a beautifully glowing ember bed which create a