Andirons and fireplace grates, share the same roll in the fireplace, which is to create a more efficient burn. In order for a fire to function properly, it has to be able to breathe. A fire receives the bulk of its oxygen from below, which is the reason for having andirons or fireplace grates.
Andirons, sometimes called fireplace dogs, are paired metal supports used to keep firewood off the hearth floor so that air can circulate beneath the fire. Viewed from the side, andirons are often L-shaped, with the lower portion supported by short legs. Viewing from the front, andirons are highly decorative and may be adorned with emblems or crests. They are often made from iron, brass, or steel. Basically andirons help to keep logs from rolling forward into the living area. More than a century ago, andirons were used to help with cooking in the hearth.
As for fireplace grates, they serve the same purpose as andirons, by supporting firewood and allowing air circulation beneath the fire for maximum burning efficiency. However, grates are more functional than decorative. Usually they are manufactured as ordinary steel or iron grids supported by four short legs. Grates allow you to stack more logs with smaller wood scraps plus kindling. They are designed to be rugged, yet attractive. Grates are available in different widths and depths to accommodate different-size hearths.
The size of your fireplace grate will depend upon how large the fireplace opening is. Some grates are designed for more firewood but usually they will allow between 5-6 medium-sized logs to sit inside. You'll want the length of the grate to be at least 4-6 inches short of the size of the hearth opening so the oxygen can properly feed the fire.
Allow your fireplace to make a presence, be full of movement and take on a life of its own. Enhance the warm glow of the flames with andirons or fireplace grates. These fireplace accessories not only bring an element of craftsmanship but also allow air to freely circulate, encouraging the fire to burn evenly and longer!