Internal staged suppression system

An internal staged suppression system for a grain dryer, the system comprising:

• an inlet in fluid communication with a drainage elbow;
• at least one vertical column section in fluid communication with the drainage elbow and a portion of the vertical column section extending along an exterior of a grain dryer and a portion extending in an interior of the grain dryer;
• at least one horizontal column in fluid communication with the vertical column and linearly extending to a terminal end;
• at least two spray heads, spaced vertically apart from each other;
• wherein at least one of the spray heads is secured to the terminal end of the horizontal column and having a deflector cap that defines a lift off height, the lift off height being configured such that a water spray pattern is a generally horizontal spray pattern;
• wherein the at least two spray heads are positioned in a generally radial center of the interior of the grain dryer, the generally horizontal water spray pattern being sufficient to cascade water over interior walls of a plurality of grain columns spaced around the grain dryer interior;
• wherein the deflector cap is biased in a closed position relative to a spray base;
• wherein the spray base includes a diffuser configured to divide an incoming water stream such that the generally horizontal water spray pattern is maintained;
• and
• wherein at least one of the spray heads is located in a generally radial center of a burner section of the grain dryer.