Cart Remove item Thumbnail image Product Price Quantity Subtotal × Lennox Furnace Service Manual for Models CB21, CBH21, B21, CH21, ECB21 and CCB21 $8.99 Lennox Furnace Service Manual for Models CB21, CBH21, B21, CH21, ECB21 and CCB21 quantity $8.99 Update cart Cart totals Subtotal $8.99 Total $8.99 USD Proceed to checkout